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OPV transmissibility in communities after cessation of routine OPV immunization, Bill & Melinda Gates Foundation (10/28/2014 - 3/31/2017)

The Maldonado Group recently received a grant from the Bill & Melinda Gates Foundation for a 2.5 year study investigating the dynamics of oral poliovirus vaccine (OPV) household and community transmission in 3 communities in Orizaba, Veracruz, Mexico. Mexico provides a unique environment to study OPV transmission. Currently, Mexican children receive inactivated poliovirus vaccine (IPV) in their primary vaccination series. In addition, children ≤5 years old who have received at least 2 doses of IPV are eligible to receive OPV during biannual National Immunization Weeks. Our study will specifically assess the impact of different OPV vaccination rates during the February 2015 National Immunization Week on intra- and inter-household transmission of OPV. The outcome of this project will inform public policy decision-making regarding OPV cessation and the polio end-game.



Principal Investigator:

Yvonne Maldonado

Current Research Interests: 
The research I have conducted has been focused on epidemiologic aspects of viral vaccine development and prevention of perinatal HIV transmission. A major project has been to identify the molecular epidemiology of factors affecting the immunogenicity of oral polio vaccine (OPV) among children living in developing areas of the world, where OPV immunogenicity is poor. We have identified several factors which affect the poor immunogenicity of OPV and will conduct clinical studies to attempt to improve immunogenicity. We are now working on ways to understand the transmission and circulation of...
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