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      Yemen

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      Case studies of Big Catch-Up immunization in low- and middle-income countries

      Persistent challenges, compounded by setbacks during the COVID-19 pandemic, have left millions of children under-immunized. This project looks at Big Catch-Up activities in five co ...

      Publications

      Implementing the Big Catch-Up to close immunization gaps and adjust systems for restoring vaccination coverage: lessons from five countries
      6 August 2026

      Implementing the Big Catch-Up to close immunization gaps and adjust systems for restoring vaccination...

      This report synthesizes findings from mixed-methods case studies conducted in Cameroon, Nigeria, Pakistan, the United Republic of Tanzania and Yemen to...

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      The Alliance for Health Policy and Systems Research 
      20 avenue Appia, 
      1211 Geneva 
      Switzerland 
      Tel.: +41 22 791 3791 
      Fax: +41 22 791 4817 
      Email: alliancehpsr@who.int 

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