On a need’s basis, the Immunization Analysis and Insights, Vaccine Preventable Diseases (VPD) Surveillance and Risk Assessment Team of the World Health Organization (WHO) posts expression of interest (EOI) calls, inviting manufacturers of specified technologies (in vitro diagnostics also known as IVDs) to participate in a WHO product evaluation. The focus is on IVDs that are used by WHO’s laboratory networks undertaking surveillance for certain VPDs