{"id":21839,"date":"2025-10-30T06:16:25","date_gmt":"2025-10-30T06:16:25","guid":{"rendered":"https:\/\/www.ifanpvc.com\/?p=21839"},"modified":"2025-10-30T06:16:27","modified_gmt":"2025-10-30T06:16:27","slug":"what-vaccination-strategy-for-ppr-fitting","status":"publish","type":"post","link":"https:\/\/www.ifanpvc.com\/index.php\/2025\/10\/30\/what-vaccination-strategy-for-ppr-fitting\/","title":{"rendered":"PPR Fitting Of What Vaccination Strategy ?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The global campaign to eradicate Peste des Petits Ruminants (PPR), commonly known as goat plague, represents one of the most ambitious veterinary health initiatives of our time. As we approach the 2030 eradication target, the question of optimal vaccination strategy for&nbsp;<strong>PPR control<\/strong>&nbsp;has never been more critical. The effectiveness of any&nbsp;<strong>PPR vaccination<\/strong>&nbsp;program depends on multiple interconnected factors, requiring a sophisticated approach that considers epidemiological patterns, logistical constraints, and socioeconomic realities.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-understanding-the-ppr-challenge\">Understanding the PPR Challenge<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PPR is a highly contagious viral disease affecting small ruminants, primarily goats and sheep, with mortality rates reaching 90% in naive populations. The economic impact is devastating for rural communities where these animals represent crucial assets and food security. The development of effective&nbsp;<strong>PPR vaccination<\/strong>&nbsp;strategies must address several key challenges:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Animal Mobility:<\/strong>\u00a0Small ruminants are frequently moved across regions for trade, grazing, or cultural practices<\/li>\n\n\n\n<li><strong>Cold Chain Requirements:<\/strong>\u00a0Maintaining vaccine potency in remote areas with limited infrastructure<\/li>\n\n\n\n<li><strong>Disease Surveillance:<\/strong>\u00a0Accurate monitoring in regions with limited veterinary services<\/li>\n\n\n\n<li><strong>Farmer Participation:<\/strong>\u00a0Ensuring community engagement and acceptance of vaccination programs<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-strategic-vaccination-approaches\">Strategic Vaccination Approaches<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mass Vaccination Campaigns<\/strong><br>Comprehensive mass vaccination represents the cornerstone of initial&nbsp;<strong>PPR control<\/strong>&nbsp;efforts in endemic areas. This approach involves:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Target Coverage:<\/strong>\u00a0Achieving at least 80% herd immunity to interrupt virus transmission<\/li>\n\n\n\n<li><strong>Geographic Prioritization:<\/strong>\u00a0Focusing on known hotspots and high-density small ruminant areas<\/li>\n\n\n\n<li><strong>Seasonal Timing:<\/strong>\u00a0Coordinating with agricultural calendars and animal movement patterns<\/li>\n\n\n\n<li><strong>Duration:<\/strong>\u00a0Intensive campaigns typically lasting 3-5 years in each focus area<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The mass vaccination strategy has proven effective in reducing PPR incidence rapidly but requires substantial resources and political commitment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Risk-Based Vaccination<\/strong><br>As disease prevalence decreases, a more targeted approach becomes cost-effective:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transhumance Corridors:<\/strong>\u00a0Vaccinating animals along seasonal migration routes<\/li>\n\n\n\n<li><strong>Market-Based Interventions:<\/strong>\u00a0Reaching large numbers of animals at livestock markets<\/li>\n\n\n\n<li><strong>Border Areas:<\/strong>\u00a0Creating immune buffers in cross-border regions<\/li>\n\n\n\n<li><strong>High-Risk Populations:<\/strong>\u00a0Focusing on young animals and newly introduced stock<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Risk-based&nbsp;<strong>PPR vaccination<\/strong>&nbsp;maximizes impact while optimizing resource allocation during the later stages of eradication.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-vaccine-selection-and-quality-assurance\">Vaccine Selection and Quality Assurance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The choice of vaccine technology significantly influences&nbsp;<strong>PPR control<\/strong>&nbsp;outcomes:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Live Attenuated Vaccines<\/strong><br>Currently, the workhorse of&nbsp;<strong>PPR vaccination<\/strong>&nbsp;programs:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Proven Efficacy:<\/strong>\u00a0Provide long-lasting immunity with single administration<\/li>\n\n\n\n<li><strong>Thermostable Formulations:<\/strong>\u00a0New developments overcome cold chain limitations<\/li>\n\n\n\n<li><strong>DIVA Compatibility:<\/strong>\u00a0Some strains allow differentiation between infected and vaccinated animals<\/li>\n\n\n\n<li><strong>Cost-Effectiveness:<\/strong>\u00a0Affordable for large-scale deployment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Vaccine Quality Control<\/strong><br>Ensuring vaccine effectiveness requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Potency Testing:<\/strong>\u00a0Regular verification of immunogenicity<\/li>\n\n\n\n<li><strong>Safety Monitoring:<\/strong>\u00a0Surveillance for adverse effects<\/li>\n\n\n\n<li><strong>Cold Chain Maintenance:<\/strong>\u00a0Temperature monitoring throughout distribution<\/li>\n\n\n\n<li><strong>Batch Tracking:<\/strong>\u00a0Complete traceability from production to administration<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-implementation-framework\">Implementation Framework<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Successful&nbsp;<strong>PPR vaccination<\/strong>&nbsp;programs require robust implementation systems:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Delivery Infrastructure<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fixed Posts:<\/strong>\u00a0Veterinary clinics providing routine vaccination services<\/li>\n\n\n\n<li><strong>Mobile Teams:<\/strong>\u00a0Reaching remote and pastoralist communities<\/li>\n\n\n\n<li><strong>Community-Based Providers:<\/strong>\u00a0Training local animal health workers<\/li>\n\n\n\n<li><strong>Private Sector Engagement:<\/strong>\u00a0Involving veterinary drug suppliers and practitioners<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Logistics Management<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Supply Chain Optimization:<\/strong>\u00a0Ensuring timely vaccine availability<\/li>\n\n\n\n<li><strong>Equipment Standardization:<\/strong>\u00a0Reliable vaccination equipment and materials<\/li>\n\n\n\n<li><strong>Waste Management:<\/strong>\u00a0Safe disposal of used vaccination materials<\/li>\n\n\n\n<li><strong>Emergency Preparedness:<\/strong>\u00a0Contingency plans for disease outbreaks<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-monitoring-and-evaluation\">Monitoring and Evaluation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measuring&nbsp;<strong>PPR vaccination<\/strong>&nbsp;effectiveness requires comprehensive monitoring:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coverage Assessment<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Administrative Data:<\/strong>\u00a0Recording numbers of animals vaccinated<\/li>\n\n\n\n<li><strong>Post-Vaccination Surveys:<\/strong>\u00a0Independent verification of coverage rates<\/li>\n\n\n\n<li><strong>Serological Monitoring:<\/strong>\u00a0Measuring population immunity levels<\/li>\n\n\n\n<li><strong>Geospatial Mapping:<\/strong>\u00a0Visualizing vaccination coverage gaps<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Impact Evaluation<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Disease Incidence:<\/strong>\u00a0Monitoring PPR case reduction<\/li>\n\n\n\n<li><strong>Economic Analysis:<\/strong>\u00a0Calculating return on investment<\/li>\n\n\n\n<li><strong>Social Assessment:<\/strong>\u00a0Evaluating community acceptance and participation<\/li>\n\n\n\n<li><strong>Environmental Impact:<\/strong>\u00a0Assessing ecological consequences of reduced mortality<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-integration-with-other-health-services\">Integration with Other Health Services<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Maximizing&nbsp;<strong>PPR vaccination<\/strong>&nbsp;effectiveness often involves integration:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>One Health Approach<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Human Health Linkages:<\/strong>\u00a0Coordinating with public health systems<\/li>\n\n\n\n<li><strong>Wildlife Interface:<\/strong>\u00a0Monitoring disease in wild small ruminants<\/li>\n\n\n\n<li><strong>Ecosystem Considerations:<\/strong>\u00a0Understanding environmental factors in disease transmission<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Multivalent Vaccination<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Combined Delivery:<\/strong>\u00a0Administering PPR vaccine with other essential vaccines<\/li>\n\n\n\n<li><strong>Parasite Control:<\/strong>\u00a0Coordinating with deworming programs<\/li>\n\n\n\n<li><strong>Nutritional Support:<\/strong>\u00a0Linking vaccination with animal feeding programs<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-challenges-and-solutions\">Challenges and Solutions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Financial Sustainability<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Government Commitment:<\/strong>\u00a0Securing domestic funding for\u00a0<strong>PPR control<\/strong><\/li>\n\n\n\n<li><strong>International Support:<\/strong>\u00a0Leveraging global partnerships and funding<\/li>\n\n\n\n<li><strong>Private Investment:<\/strong>\u00a0Engaging commercial stakeholders<\/li>\n\n\n\n<li><strong>Community Contribution:<\/strong>\u00a0Establishing cost-sharing mechanisms<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Technical Barriers<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Capacity Building:<\/strong>\u00a0Training veterinary professionals and community workers<\/li>\n\n\n\n<li><strong>Research Investment:<\/strong>\u00a0Addressing knowledge gaps in PPR epidemiology<\/li>\n\n\n\n<li><strong>Technology Transfer:<\/strong>\u00a0Sharing advances in vaccine technology and delivery<\/li>\n\n\n\n<li><strong>Quality Assurance:<\/strong>\u00a0Maintaining standards across all program components<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-regional-coordination\">Regional Coordination<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PPR eradication requires cross-border cooperation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Harmonized Strategies<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Synchronized Campaigns:<\/strong>\u00a0Coordinating vaccination timing across borders<\/li>\n\n\n\n<li><strong>Standardized Protocols:<\/strong>\u00a0Agreeing on common technical approaches<\/li>\n\n\n\n<li><strong>Joint Surveillance:<\/strong>\u00a0Sharing disease monitoring information<\/li>\n\n\n\n<li><strong>Resource Sharing:<\/strong>\u00a0Pooling technical expertise and materials<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Political Commitment<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High-Level Engagement:<\/strong>\u00a0Securing ministerial and head-of-state support<\/li>\n\n\n\n<li><strong>Regional Organizations:<\/strong>\u00a0Leveraging existing political and economic communities<\/li>\n\n\n\n<li><strong>International Frameworks:<\/strong>\u00a0Working within global animal health architectures<\/li>\n\n\n\n<li><strong>Legal Instruments:<\/strong>\u00a0Developing binding agreements for disease control<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-road-to-2030-eradication-timeline\">The Road to 2030: Eradication Timeline<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The global&nbsp;<strong>PPR control<\/strong>&nbsp;strategy follows a phased approach:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Phase 1: Assessment and Planning (Completed)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Situation analysis and resource mapping<\/li>\n\n\n\n<li>National strategy development<\/li>\n\n\n\n<li>Partnership establishment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Phase 2: Control and Reduction (Current Phase)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intensive vaccination in endemic areas<\/li>\n\n\n\n<li>Strengthening veterinary services<\/li>\n\n\n\n<li>Building surveillance systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Phase 3: Eradication (2025-2030)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Targeted vaccination in remaining foci<\/li>\n\n\n\n<li>Certification of freedom processes<\/li>\n\n\n\n<li>Post-eradication planning<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-success-factors-and-best-practices\">Success Factors and Best Practices<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Analysis of successful&nbsp;<strong>PPR vaccination<\/strong>&nbsp;programs reveals key success factors:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Community Engagement<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cultural Sensitivity:<\/strong>\u00a0Understanding local practices and beliefs<\/li>\n\n\n\n<li><strong>Participatory Planning:<\/strong>\u00a0Involving communities in program design<\/li>\n\n\n\n<li><strong>Local Leadership:<\/strong>\u00a0Engaging traditional and religious leaders<\/li>\n\n\n\n<li><strong>Gender Consideration:<\/strong>\u00a0Addressing women&#8217;s roles in small ruminant management<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Program Management<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Clear Objectives:<\/strong>\u00a0Setting measurable targets and timelines<\/li>\n\n\n\n<li><strong>Adaptive Management:<\/strong>\u00a0Responding to implementation challenges<\/li>\n\n\n\n<li><strong>Transparent Reporting:<\/strong>\u00a0Regular progress updates to all stakeholders<\/li>\n\n\n\n<li><strong>Knowledge Management:<\/strong>\u00a0Documenting and sharing lessons learned<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-conclusion-towards-a-ppr-free-world\">Conclusion: Towards a PPR-Free World<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The vaccination strategy for&nbsp;<strong>PPR control<\/strong>&nbsp;represents a complex but achievable goal that requires coordinated action at local, national, and global levels. The technical tools for eradication exist\u2014effective vaccines, proven delivery strategies, and adequate diagnostic capabilities. The remaining challenges are primarily organizational and financial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Success will depend on sustained political commitment, adequate funding, strong veterinary systems, and active community participation. By learning from past eradication campaigns and adapting to local contexts, the global community can achieve the 2030 target of PPR eradication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The benefits extend far beyond animal health\u2014reducing poverty, improving food security, and strengthening the resilience of rural communities. A world free of PPR is within reach if we maintain the momentum and continue to refine our vaccination strategies based on evidence and experience.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">If you have read this article and have any questions, please feel free to contact <a href=\"https:\/\/www.ifanpvc.com\/\">IFAN<\/a>. Below is our contact information:<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Whatsapp:<a href=\"https:\/\/api.whatsapp.com\/send\/?phone=8613373827623&amp;text&amp;type=phone_number&amp;app_absent=0\">+86 13373827623<\/a><br>Email\uff1a<a href=\"mailto:sales06-ifan@ifangroup.com\">sales06-ifan@ifangroup.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The global campaign <\/p>\n","protected":false},"author":1,"featured_media":21677,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[140],"class_list":["post-21839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-ppr-fitting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.0 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>PPR Fitting Of What Vaccination Strategy ? - www.ifanpvc.com<\/title>\n<meta name=\"description\" content=\"The effectiveness of any\u00a0PPR vaccination\u00a0program depends on multiple interconnected factors,PPR Fitting requiring a sophisticated\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ifanpvc.com\/index.php\/2025\/10\/30\/what-vaccination-strategy-for-ppr-fitting\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PPR Fitting Of What Vaccination Strategy ?\" \/>\n<meta property=\"og:description\" content=\"The effectiveness of any\u00a0PPR vaccination\u00a0program depends on multiple interconnected factors,PPR Fitting requiring a sophisticated\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ifanpvc.com\/index.php\/2025\/10\/30\/what-vaccination-strategy-for-ppr-fitting\/\" \/>\n<meta property=\"og:site_name\" content=\"www.ifanpvc.com\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-30T06:16:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-30T06:16:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ifanpvc.com\/wp-content\/uploads\/2025\/10\/14-1.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"750\" \/>\n\t<meta property=\"og:image:height\" content=\"750\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"TIMOR\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"TIMOR\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/index.php\\\/2025\\\/10\\\/30\\\/what-vaccination-strategy-for-ppr-fitting\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/index.php\\\/2025\\\/10\\\/30\\\/what-vaccination-strategy-for-ppr-fitting\\\/\"},\"author\":{\"name\":\"TIMOR\",\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/#\\\/schema\\\/person\\\/888953a660af5ad9d0629e6629151a54\"},\"headline\":\"PPR Fitting Of What Vaccination Strategy ?\",\"datePublished\":\"2025-10-30T06:16:25+00:00\",\"dateModified\":\"2025-10-30T06:16:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/index.php\\\/2025\\\/10\\\/30\\\/what-vaccination-strategy-for-ppr-fitting\\\/\"},\"wordCount\":1079,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/index.php\\\/2025\\\/10\\\/30\\\/what-vaccination-strategy-for-ppr-fitting\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ifanpvc.com\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/14-1.webp\",\"keywords\":[\"ppr fitting\"],\"articleSection\":[\"Knowledge\"],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ifanpvc.com\\\/index.php\\\/2025\\\/10\\\/30\\\/what-vaccination-strategy-for-ppr-fitting\\\/\",\"url\":\"https:\\\/\\\/www.ifanpvc.com\\\/index.php\\\/2025\\\/10\\\/30\\\/what-vaccination-strategy-for-ppr-fitting\\\/\",\"name\":\"PPR Fitting Of What Vaccination Strategy ? 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