Dr. Stephen De Rosa develops assays to characterize our immune responses to vaccination against pathogens including HIV, tuberculosis, SARS-CoV-2 and malaria. In particular, he develops, optimizes and validates flow cytometry-based assays that detect whether a vaccine triggers responses from T and B cells, critical immune cells that can be engaged by a vaccine to protect against future infection and disease. These assays are essential to assessing a vaccine’s protective potential, and De Rosa’s work supports large vaccine trial networks, including the HIV Vaccine Trials Network (HVTN), that test vaccines around the globe.