Reshaping the equitable and inclusive access to healthcare: A qualitative study

Background Improving equitable access to healthcare requires innovative interventions and strengthening a service innovation operational model to achieve transformative change and bring sustainability to public health interventions. The current study aims to identify the components of the Mobile Medical Units (MMUs) operational model as an innovative intervention to provide equitable and inclusive access to healthcare. Methods The study used qualitative research to identify the components of the operational model of MMUs for primary healthcare in future. Data has been collected via semi-structured in-depth interviews with 103 healthcare professionals from six states representing India's Tier I, Tier II, and Tier III regions. A thematic analysis was performed to examine emergent salient themes. Results The study identified and examined scalability, affordability, replicability, and sustainability as the four critical components of the operational model of MMUs. The findings of the study indicated that MMUs with these four components played a vital role in COVID-19 immunization, especially in resource-limited settings. The study found that MMUs are a cost-effective and scalable healthcare delivery model that can be easily replicated in primary healthcare service delivery. Conclusion The findings underscore the significant role of MMUs in addressing healthcare disparities, particularly in resource-limited settings. The adaptability and cost-effectiveness of MMUs make them an ideal solution for primary healthcare delivery, especially in Tier I, II, and III regions of India. It lays a foundation for future research and policy-making, emphasizing the need for innovative, equitable, and sustainable healthcare delivery models like MMUs to transform and strengthen healthcare systems globally.


Introduction
Equitable access to healthcare for rural, tribal, and underprivileged people has been an emerging area of interest for researchers, academicians, and policymakers worldwide. 1Healthcare practitioners have been striving to adopt cutting-edge strategies to suit the changing requirements of our population's health equitably and sustainably. 2The limited and inconvenient access to healthcare facilities by immunocompromised, hesitant people and underserved communities leads to reduced vaccine uptake, the low effectiveness of immunization programs, and the failure of other healthcare programs. 3,4In this context, Mobile Medical Units (MMUs) hold a significant promise to provide equitable and convenient access to various healthcare facilities, including vaccinations, to the underserved and immunocompromised population. 5MMUs may be the only way for some individuals to access critical medical care. 6MMUs are an innovative model of health services delivery that play a crucial role in providing healthcare to vulnerable populations, especially in areas with limited resources. 7,8Many people may not have access to primary health care and immunization programs without mobile clinic services.
MMUs are an underutilized resource within the healthcare system. 9he mobility and versatility of MMUs make them excellent partners for combating pandemics like COVID-19. 10In many regions of the world, MMU programs already play significant, though undervalued, roles in the healthcare system. 11They fill gaps in the healthcare safety net, reaching socio-economically underserved populations in urban and rural areas, and offer versatility in setting a damaged or inadequate healthcare infrastructure.They also provide access to healthcare, especially for displaced or isolated individuals.MMUs have been struggling to gain widespread support in developing countries, despite mounting evidence of their distinctive usefulness and ability to be highly adaptable as a treatment model.This has led to a squandered opportunity to use these previously established and reliable initiatives to remove access hurdles faced by under-resourced areas and to deploy MMU during national emergencies like the COVID-19 epidemic.
MMUs are a well-established type of community-based service delivery that bridges the gaps in healthcare safety nets and reaches communities that are socially and economically marginalized in urban and rural locations. 12MMUs are a crucial tool for providing high-quality care to medically disadvantaged communities in various regions of the world.With a cutting-edge approach to healthcare delivery, MMUs can potentially reduce health inequities among underprivileged communities and those with chronic illnesses.Several studies have found that MMUs have a more significant impact when they provide emergency treatment, do preventative health screenings, and start managing chronic diseases. 13,14MMUs can provide personalized, highly effective, reasonably priced health care that flexibly adapts to the community's changing requirements by entering communities directly and utilizing existing community resources.
In addition to the requirement, the highlighted gaps in the literature provide adequate grounds for conducting an empirical study on enhancing the scalability and sustainability of mobile health clinics.Extant literature showcases that the primary reasons MMUs encounter challenges are the lack of a clearly defined framework for these clinics in healthcare providers' plans and present policymaking. 7,8,15The main objective of this study is to examine the critical factors necessary to construct an operational model for mobile health clinics that may be used for other public health initiatives in the future.
The study has incorporated a three-pronged strategy in this remark to identify and examine various ways towards the sustainability and replicability of MMUs in the healthcare system: The first stage identifies the components of MMUs' operational model, which can be replicable for primary healthcare in the future.An extensive literature review has been conducted to identify the components of MMUs' operational model.In the second stage, the elements identified have been examined to determine their impact on immunization performance through semistructured in-depth interviews.Thus, in this direction, Jivika Healthcare's service innovation support, VaccineOnWheels (VOW), is considered among several organizations catering to vaccination services through MMUs.The working model exhibited by VOW is exemplary, as the MMUs under the organization are equipped with all the necessary supplies and equipment required for immunization, and the health workers are trained to provide immunization services safely and effectively.Under the third stage, the study delineates strategic recommendations for strategic professionals to strengthen and sustain MMUs in primary healthcare in the future.

Case organization
In the context of MMUs in India, the study has considered Vacci-neOnWheels (VOW) as the case organization.In 2019, Jivika Healthcare Private Limited launched Vaccine on Wheels-First India's Doctor-based Mobile Vaccination Clinic to "ensure access to quality vaccination for all" and aimed to reduce inequality and increase immunization reach, provide low-cost vaccines, and create awareness of immunization.
This program helped to understand the gaps in the vaccine delivery model from close quarters and identify various issues faced by diverse stakeholders, primarily infants/caregivers/parents, in getting vaccinated.VOW has made vaccines accessible to the elderly, individuals with disabilities, female sex workers, tribal communities, rural communities, street vendors, maids, slum residents, frontline workers, bedridden, and school children, among other vulnerable segments of society.They have also provided door-to-door service to those who could not reach the vaccination center.They have served the people residing in remote locations of the six states through more than 200 mobile vaccination units.Under the unique framework of the Public-Private Partnership Model (PPP), vaccination is administered at a reduced cost for beneficiaries with vaccines provided by the government.The PPP model enables stakeholder collaboration across industries under Corporate Social Responsibility (CSR), government, and Non-Governmental Organizations (NGOs) to share a commitment to making vaccination services available even at grassroot levels.This initiative shall help India achieve higher immunization penetration by getting faster acceptance towards vaccination, giving more convenience, and reducing the cost of seeking service with zero travel cost, travel time, and low wages.

Methodology
The extant literature underscores the significance of qualitative research in public health, and this study adopted an exploratory qualitative research design to examine the concepts and processes related to MMUs. 16,17This design is particularly apt for understanding the scalability, affordability, sustainability, and replicability of such clinics in enhancing immunization coverage in selected states and districts.
The methodology was enriched by incorporating a systematic content analysis of the interview data. 18The verbal responses were transcribed verbatim after conducting group and in-depth interviews with key stakeholders of the VaccineOnWheels (VOW) initiative.This transcription served as the basis for an in-depth content analysis.Initially, a familiarization phase involved thoroughly reading the transcripts to identify preliminary themes related to the research questions.Subsequently, a coding process was implemented, tagging text segments with specific codes that encapsulated critical concepts related to the study's focus areas.
This coding led to identifying recurring themes, which were then reviewed and refined for coherence and relevance to the research questions.The themes were defined and named, ensuring they accurately captured the essence of the stakeholders' perspectives on the scalability, affordability, sustainability, and replicability of mobile clinics.

Data collection
In-depth, semi-structured interviews were conducted across selected states and districts, targeting a diverse group of healthcare stakeholders.These stakeholders included health officers, grassroots workers, mobile clinic operators, NGOs, strategic partners, policymakers, and other support staff.The interviews delved into various aspects of the immunization program, focusing on scalability, affordability, sustainability, and replicability.Additionally, stakeholders shared their experiences and insights on challenges, innovations, and best practices contributing to high immunization rates.
A total of 102 respondents, directly involved in the mobile clinic vaccination campaign, provided valuable data.These respondents represented a cross-section of roles within the healthcare system and hailed from states where VOW was operational, including Jharkhand, Maharashtra, Meghalaya, Karnataka, Telangana, and Tamil Nadu.
With consent obtained for recording and transcribing the interviews, the data was methodically processed for content analysis.The transcribed data was meticulously coded to identify patterns and themes.This coding was not merely descriptive but also interpretive, aiming to extract deeper meanings and insights from the stakeholders' narratives.The analytical process was iterative, with ongoing refinement of themes to ensure they precisely reflected the complexities and nuances of the stakeholders' experiences and perspectives.This comprehensive analysis was critical for developing a nuanced understanding of the factors affecting the success of mobile-based vaccination clinics in the selected regions.
The distribution of cities across different tiers in the states of Maharashtra, Karnataka, Tamil Nadu, Jharkhand, Meghalaya, and Telangana, are categorized based on their urban tier classification.In Maharashtra, the cities are variedly placed with Mumbai and Pune in Tier 1, Aurangabad and Nashik in Tier 2, and Nanded, Latur, and Thane in Tier 3. Karnataka is represented by Bengaluru, a Tier 1 city.Tamil Nadu has Tirunelveli in Tier 2, while Ranipet and Tirupathar are in Tier 3. Jharkhand's representation includes Chatra, West Singhbhum, and Lohardagga, all classified as Tier 3 cities.Meghalaya is represented by East Khasi Hills, also in Tier 3. Lastly, in Telangana, both Sangareddy and Wanaparthy are categorized as Tier 3 cities.This classification provides a clear understanding of the urban hierarchy and demographic distribution across these states, which is crucial for contextualizing various developmental and policy-related initiatives.

Respondents' profile
A total of 103 interviews were conducted in six selected states of India.Participants included Accredited Social Health Activist (ASHA) employees, Gram Sevaks, District Health Officers (DHOs), Taluka Health Officers (THOs), Chief Health Officers (CHOs), Senior Medical Officers (SMOs), Assistant Health Officers (AHOs), Medical officers (MOs), Campaign coordinators, and other personnel involved in this immunization program.More than 50% of the participants were medical officials.From the total number of interviews, around 56% of the respondents were working in rural or tribal areas, 21% were working in Tier-II districts or cities, and the remaining 23% represented the health workers from Tier-I cities or districts.Fig. 1 shows the composition of interviews conducted from different regions.

Findings from qualitative analysis
Fifteen of the twenty-four participants from Tier-I cities and districts are from Maharashtra, while nine are from Bengaluru, Karnataka.The responses from Tier-I areas comprise several medical officials and other essential support personnel who supported the vaccination program.Before analyzing the interviews, there was a preconceived belief that Tier-I healthcare systems are superior to Tier-II and rural healthcare systems.Even if the healthcare system is improving, gaps may be addressed to enhance the system further.One of the objectives of this qualitative analysis is to comprehend the operation of the mobile vaccination program in Tier-I locations in collaboration with government agencies and other stakeholders.The analysis would highlight the principal role of the many stakeholders, the significant impacts noticed, the essential operation comprising planning and execution, the problems encountered, and concluding remarks on the program's viability and scalability.Tier-II regions account for twenty-one percent of overall participants.Similar to the composition of respondents in Tier-I regions, more than fifty percent of respondents in this domain are medical officials.The remainder of the participants reflects those participating in the coordination and assistance of the immunization campaign.Fifty-seven of the 103 interviewees are from rural or tribal locations.Approximately 56 percent of the study's participants are from rural and tribal communities.Since the objective of the mobile vaccination team was to vaccinate as many people as possible in rural and tribal communities, the team was effective in this region.
The interviews were observed and evaluated following the status of the regions.Select excerpts from the interviews have been displayed in Table 1.The sub-dimensions of significant factors are identified and cross-compared with all the districts representing different regions.The detailed cross-comparison of each dimension is given in Table 2.It also showcases different stakeholders' perceptions and consolidated responses.Following cross-comparisons of dimension, significant problems faced by the mobile clinic team are classified and segregated according to a different region.Table 3 displays critical problems and major interventions taken by the VOW team to resolve those issues.
After examining the immunization program in Tier-I regions, it was determined that it was well-planned and carried out.The assignments were allotted appropriately, and the project was completed according to the plan-generated schedule.Observing the key obstacles faced by the stakeholders, it was noticed that no significant obstacles were encountered during the program.It indicates that the program ran smoothly in Tier I locations.In addition, it was underlined that primary healthcare programs require minimum support from the mobile vaccination team.
The immunization program in Tier-II regions appeared comparable to that in Tier-I locations.However, there were a few operational differences.In Tier-II regions, it was noticed that the team's contribution was substantial.Recall that the team was also engaged in data management tasks.Concerning obstacles, the team needed more in terms of people management, reluctance, and shortage of workers.In these regions, the expansion and extension of the program make sense.Consequently, Tier-II locations are believed to require a mobile vaccination team for immunization programs.
Finally, the program in rural and tribal regions is analyzed.The program's objectives aligned nicely with tribal and rural regions.Despite vaccination operations progressing, the program encountered reluctance, technical issues, geographical obstacles, and infrastructural difficulties.It has been noticed that it is difficult to vaccinate rural populations using the conventional method.This door-step approach, with the assistance of VOW, was successful.As an extension of this approach, a similar model would be effective for primary healthcare in rural and tribal areas.
Table 1 in the study presents a detailed overview of the roles, impacts, coordination strategies, challenges, and future prospects of the MMUs in the COVID-19 vaccination program across different geographical tiers in India.In Tier-I areas, local public health governance, effective ward monitoring, and a door-step service approach were key in addressing hesitancy and logistical challenges, leading to improved immunization rates in slum areas.In Tier-II regions, MMUs focused on identifying less-covered areas, scheduling convenient vaccination sessions, and ensuring outreach to marginalized groups like sex workers and transgender individuals, resulting in a significant increase in vaccination coverage.In rural and tribal areas, the challenges were more pronounced due to scattered populations and low health literacy.MMUs addressed these through strategies like early morning and late evening sessions, mobilizing the population with the help of local leaders, and deploying vans to reach difficult terrains, substantially increasing vaccine coverage.
Coordination efforts involved microplanning, using communication platforms for information dissemination, and scheduling vaccination drives in advance.Challenges varied across regions but commonly included hesitancy, technical issues, and logistical difficulties.The potential for expanding primary healthcare through MMUs was also recognized, with suggestions for collaboration with local organizations and utilizing MMUs for routine immunization, especially in hard-toreach areas and for vulnerable populations.The expansion of the program was envisioned to enhance vaccination rates, cover school-going children, and provide logistics support in rural areas.Overall, MMUs have demonstrated their versatility and effectiveness in diverse settings, suggesting their pivotal role in future healthcare initiatives.• Mobilizing beneficiaries was challenging • Due to the working hours, there were sometimes fewer beneficiaries available for vaccination .
• A significant concern of the people was related to the vaccine's side effects.• The problem related to the network issue was another concern because of which it was not easy to enter data immediately on the COWIN portal .
• A significant challenge was checking the beneficiaries' availability as they were daily wage workers and were mostly unavailable during the daytime.• People had many hesitations and were unwilling to take the vaccine • It was not easy to reach the interiors of the remote villages • The tribal and rural population was scanty and scattered, which required additional planning to schedule the vaccination sessions • Because of less number of people available for vaccination at times, vials also remained unused Primary healthcare feasibility • Initialized discussion for primary healthcare concerning the age group 0-5 years • Should collaborate with municipality and local organizations to work for routine immunization • The support from mobile teams will be an added advantage.
• Primary healthcare can be conducted in collaboration with MMUs for better reach.• MMUs will provide an added workforce to cover a vast population.• MMUs' professional teams can aid in supporting the primary healthcare initiative.
• Association with MMUs for primary healthcare can be highly beneficial for rural and interior tribal areas.were key in mobilizing beneficiaries and increasing vaccine uptake through active community engagement.Coordination, planning, and execution across all tiers involved tasks like identifying vaccination sites, managing beneficiary lists, session scheduling, and overcoming infrastructural and technical challenges.
The impact of these collective efforts was significant, leading to increased reachability and vaccination coverage, especially among marginalized groups and in remote areas.The strategic views of these stakeholders highlighted the need for more support staff and MMUs, especially for school-going children, and suggested the potential for replicating this model in other states for primary healthcare.This comprehensive stakeholder analysis underscores the multifaceted approach required to effectively implement vaccination programs and the potential scalability of such models for broader healthcare initiatives.
Table 3 in the paper delineates the critical problems, interventions by VOW, and their impacts across different tiers, revealing a nuanced approach to addressing diverse challenges in vaccination campaigns.In Tier-I regions, VOW effectively mitigated hesitancy in slum areas and

Top-level management
The administrative support was satisfactorily provided, including timely assistance and guidance.
There was legal and technical assistance and training, including guidelines to access and manage data in the CoWIN portal.
Health officers were prompt enough to monitor, supervise and evaluate the program.They also identified and selected the regions for the vaccination program.They also ensured a regular supply of the required vaccines and other medical equipment.
Administrative support was adequately available to facilitate the vaccination program.The required clearances were fast-tracked, and necessary approvals were timely made.
All the procurements were done under NHM (National Health Mission).
NGOs and community leaders actively mobilized the beneficiaries for participation in the immunization program.They had a more significant impact on the local population.

Coordination, Planning, & Execution
Their main task was to identify regions and sites for conducting vaccination programs.
The grass root workers also prepared the list of beneficiaries.
The other essential task was to enter the data and make registrations.Daily reporting of the number of vaccinated people was another important objective.
A typical communication platform (WhatsApp and Phone calls) seamlessly transferred knowledge.Teams were formed, keeping the strength of the beneficiaries in mind.
The sessions were planned and scheduled according to the availability of the beneficiaries.Session planning and scheduling There were regular reviews of the status of vaccination campaigns.A review of vaccination coverage was also conducted simultaneously.
The initiation of the campaign in select regions based on vaccination coverage was well-planned and coordinated.
Assigning of the blocks and respective health officers for vaccination through MMUs was also conducted.Facilitated the immunization program diligently.
NGOs like 'Give India' ensured there was enough funding for the execution of the vaccination program effectively.
NGOs supported the mobilization of the beneficiaries.There was the active involvement of the NGOs in community engagement.They helped in motivating the local population to get themselves vaccinated.

Challenges
The major challenge revolved around vaccine hesitancy.Immobilization was highly prevalent.
Health illiteracy among the local population was also one of the critical reasons for the lower vaccination rate initially.Rumors regarding the ill effects of the vaccination were considered one of the significant reasons.
Since the transportation service in the local areas could be more robust, leading to a lower vaccination rate.
There were issues related to the infrastructure.
One of the major issues revolved around the technical glitch.
At times there was a lack of assessing the vaccination program.Sometimes it was observed that there needed to be more appropriate preparation for IEC.
Specific infrastructural issues acted as a significant challenge during the vaccination program.However, most challenges were handled diligently, and due arrangements were made to combat the infrastructural challenge.For example-the supply chain and logistics were well coordinated.
The crucial challenges revolved around the immobilization of the beneficiaries.There were substantial efforts to eradicate the rumors about the side effects of vaccination.Especially in rural areas, such rumors were widespread because the decision to get vaccinated was delayed.

Impact
The grass root workers significantly impacted the reachability of the vaccination program.Since they knew the local demographics, it helped in reaching the beneficiaries.
The health officers significantly impact greater reachability, a higher vaccine uptake, and broader immunization coverage.
It immensely impacted reachability, and they ensured that the unreachable was reached.
The immunization coverage was increased, leading to a successful vaccination program.
The vaccine uptake was increased with the involvement of the community as the local population was more comfortable with them.Overall, community engagement was increased, and a higher number of people were vaccinated.

Strategic views
As the vaccination program grows, more support is required in terms of the number of support staff and MMUs, especially for the coverage of school-going children.
With the aid of ASHA and ANM workers, vaccination programs can have greater penetration in the interiors.
The program can be replicated in other states with similar actions but requires thorough training before moving to primary healthcare.Primary healthcare requires a higher level of expertise since children are involved.
The model can also be scaled up by engaging MMUs in other states.This program can be replicated according to the demographics of the concerned states.Regarding routine immunization, already a standard system is well in place.Therefore no primary need is felt for another program to be executed.
It will benefit a more extensive set of populations if implemented nationwide.The model has the potential to conduct primary healthcare as well.As it was observed that health workers during the vaccination program were reaching the door-step, if a similar door-todoor primary healthcare is conducted, more children will be vaccinated.
among specific populations like migrant workers, sex workers, and transgender individuals, through tailored approaches like doorstep vaccination and collaboration with local leaders, resulting in increased willingness to vaccinate.They combated server issues by physically registering data and resolved misinformation about vaccine side-effects through clear communication, thereby boosting confidence in the vaccine.In Tier-II areas, door-to-door mobilization by VOW and ASHA workers, scheduling adjustments, and counseling sessions to counter hesitancy and misinformation led to greater vaccine coverage and beneficiary confidence.Rural and tribal regions presented unique challenges, including unavailability of daily wage workers, high vaccine reluctancy, low health literacy, and logistical issues due to scattered populations and challenging terrain.VOW addressed these through strategies like timing vaccination sessions to suit local schedules, engaging community leaders for better outreach, employing appropriate Information, Education, and Communication (IEC) strategies, using vans for increased reachability, and organizing vaccination at convenient locations for scattered populations.These adaptive and communityfocused strategies significantly enhanced the reach and impact of the vaccination program, demonstrating the effectiveness of VOW's approach in diverse settings.

Discussion
Numerous global immunization programs have been implemented to eliminate various diseases.However, the COVID-19 vaccination campaign adopted a different strategy, aiming to vaccinate a large population in a short time to achieve herd immunity.This posed challenges in countries like India, where a significant portion of the population resides in rural and tribal areas, requiring targeted interventions.One such intervention was the implementation of mobile vaccination units, specifically the VOW model, which successfully increased vaccination reachability and facilitated rapid immunization against COVID-19 in rural areas.The scalability, affordability, replicability, and sustainability of the mobile vaccination program were found to be crucial factors affecting vaccination rates and coverage.
The study examined the operational aspects of the VOW program in different regions, including Tier-I, Tier-II, and rural or tribal areas, and found that the initiative was successful in all regions, although operational actions varied.Vaccine hesitancy and acceptance which is a critical issue in immunization, was found to be lower in Tier-I regions due to higher health awareness, while rural and tribal regions exhibited higher reluctance towards vaccines and vaccination programs due to prevalent myths and lower health awareness. 19Apart from this, multiple perceptions are attached to COVID-19 immunization. 20Fig. 2

Table 3
Critical problems, intervention, and impact.

Tier-I Hesitancy in slum areas
The VOW team and local municipal leaders resolved any hesitancy related to vaccination.
More people were willing to take the vaccine.
Difficulty vaccinating specific populations (migrant workers, sex workers, transgender people etc.) The VOW team reached their door-step to make them comfortable, as they hesitated to go to the vaccination camps A more significant number of marginalized populations was covered.

Difficulty in mobilizing beneficiaries
The team conducted awareness programs, and beneficiaries were given counseling.
People were impacted positively, and the number of vaccinated people grew slowly.

Server issues
During server issues, data regarding vaccination was registered physically Physically registered data was uploaded by the VOW personnel once the server resumed, thereby no data was missed Rumors about vaccine adverse effects Any doubts about the vaccine's post-effects were communicated to the beneficiaries.
People were more confident regarding the COVID-19 vaccine Tier-II

Mobilization issues
The VOW team and ASHA workers went door to door to mobilize the population A more significant number of people were vaccinated.
Scheduling issues (Clash of session timings with working hours of beneficiaries) The VOW team visited the beneficiaries in the early morning and late evening hours per their availability.
It led to more excellent coverage and an assurance that no one would be left behind.Gathered the beneficiaries at a commonplace in their region Small pockets where people were less in number were vaccinated at their convenience Transportation issues (Poor roads and infrastructure) Avoided rainy days to travel; Departed early to reach the vaccination site on time VOW team was prompt to address such issues and planned accordingly; thus, reachability increased Fig. 2. Position of regions in vaccine hesitancy-health awareness matrix.graphical representation of the regions based on vaccine hesitancy and health awareness.
Furthermore, the study identified that Tier-I regions already had well-performing primary healthcare programs and better infrastructure, resulting in lower utilization of MMUs.However, MMUs effectively delivered routine immunizations in Tier-II regions and addressed the needs of hard-to-reach areas, particularly in rural and tribal communities.Fig. 3 depicts the positioning of regions based on hard-to-reach areas and the usefulness of MMUs.
The qualitative investigation revealed that the mobile clinic approach employed by MMUs has the potential for widespread deployment and expansion beyond COVID-19 immunization.The findings suggest that this innovative approach can be applied to various routine and other healthcare services, necessitating administrative support for national integration.With the support of community healthcare workers and frontline forces, MMUs have the capacity to provide vaccination services to vulnerable populations in both rural and urban areas, benefiting low-income minority communities with significant health inequalities. 21,22Moreover, MMUs can aid in the early-stage detection and prevention of chronic diseases, diagnostic operations, and other healthcare support services.
The mobile vaccination approach, specifically the VOW model, has proven effective as per the findings of the study in reaching underserved populations and facilitating rapid immunization against COVID-19.This innovative strategy has broader implications for routine healthcare services and can be applied on a larger scale to build sustainable mobile clinic programs, benefiting vulnerable communities and improving overall healthcare delivery.

Strategic recommendations
The healthcare industry is currently encouraged to evolve beyond merely providing care access, focusing on value creation through innovative business models.This shift is exemplified by the "M-CLINIC 2.0" framework, which advocates for a holistic and proactive approach to patient care, aimed at achieving optimal health outcomes.This model will leverage existing healthcare resources effectively to fulfill the anticipated health outcomes, marking a significant shift towards a more patient-centered and outcome-oriented approach in healthcare.
The healthcare industry in various regions must reconsider how the mentioned trends will impact their operational model and how they will most effectively engage in the M-Clinic 2.0 ecosystem.There is no onesize-fits-all solution for the healthcare industry, and each region will need to tailor its approach to best meet the needs of its patients.Therefore, M-Clinic 2.0 holds the potential to provide an excellent opportunity for the healthcare industry to improve the way it delivers care to patients.
The "Vaccine on Wheels" model was deployed during the peak of the third wave of COVID-19 between December 21 to March 22 by Jivika Healthcare.The model resulted in successful vaccination uptake by achieving the scale quickly and unlocking the demands by bringing socio-behavioral changes in the communities.The model has been revealed to be successful with the collaboration of government and various strategic/CSR partners in challenging and underserved regions.Based on the appreciation received from funders, administrations, state governments, development partners, and other prominent stakeholders, this model was recommended to be replicable in routine immunizations and other primary healthcare services.The strategic recommendations distinguished by longitudinal term impacts are summarized in Table 4.The recommendations are based upon the success factors of the VOW operational model, which led to a remarkable transformation in immunization coverage and other sustainable initiatives that can be implemented in the present structure of MMUs.

Conclusion
This study has aimed to understand and document the role of MMUs as an innovative intervention in enhancing healthcare accessibility, particularly during the COVID-19 pandemic.The qualitative analysis of in-depth interviews with healthcare professionals across various Indian states has emphasized the scalability, affordability, replicability, and sustainability of MMUs as critical components in their operational model.These dimensions have been recognized as pivotal in their effectiveness, especially in Tier I, II, and III regions, which face distinct healthcare challenges.
The findings emphasize the potential of MMUs as a cost-effective and adaptable solution for primary healthcare delivery in diverse settings, including resource-limited areas.The success of the VaccineOnWheels (VOW) program, particularly in rural and tribal communities, underscores the model's efficacy in reaching marginalized and hard-toreach populations, thereby addressing healthcare disparities.
This research not only contributes to the academic understanding of service innovation in healthcare but also sets a foundation for future empirical studies.The identified factors -scalability, affordability, replicability, and sustainability -offer a broad framework for quantitative analysis and the development of logical models.Such empirical studies could further elucidate the dynamics and interrelationships of these components, enhancing the general concept of innovations in immunization and healthcare programs.
Moreover, the study provides valuable insights for policymakers and healthcare providers.It underscores the necessity of adopting innovative, equitable, and sustainable models like MMUs to transform healthcare systems globally.This approach is particularly pertinent for future primary healthcare initiatives in rural and tribal areas, where traditional healthcare services are often inadequate.
In conclusion, this study serves as a vital step in documenting the innovations in COVID-19 vaccination programs and sets the stage for further research and policy development in healthcare service innovation.It offers a robust platform for expanding our understanding and application of mobile healthcare solutions in various settings, contributing to the overarching goal of achieving equitable and comprehensive healthcare access for all.

Fig. 3 .
Fig. 3. Position of regions in the matrix of hard-to-reach areas vs. MMUs' usefulness.

Table 2
of the study offers a comprehensive cross-comparison of significant factors influencing immunization, as perceived by different stakeholders, including grassroots workers, health officers,

Table 1
Select excerpts from interviews.Scheduling was done in advance by the health officers for the unvaccinated blocks.• Awareness regarding the vaccination drive was announced in the area a day before • Required vaccines were shared with the MMUs • Sessions were created, and the MMUs • entered data • The health officers did scheduling for the unvaccinated blocks Plan was made in advance and shared with the mobile clinic team.• Asha worker assisted the MMUs in the vaccination drive • Reporting was done on the sessions created by the data operator of the mobile clinic's team

•
Since hard-to-reach areas have limited transportation, MMUs can aid in providing door-to-door vaccination coverage to children below the age of 5 tional Health Mission.Community leaders and NGOs, like 'Give India,'

Table 2
Cross-comparison of significant factors of immunization (stakeholder-wise).