Dear Colleagues,

I am pleased to write to you on behalf of the Americas Dengue Prevention Board. This issue of PDVI News focuses on Field Sites, a crucial part of the PDVI program, which will only increase in importance as candidate vaccines enter fields trials later this year and next year. PDVI works with 11 field sites, some of which are funded by other donors, but all of the field sites are linked together as members of the PDVI Field Site Consortium, and are involved in dengue surveillance.