SARS-COV-2

This study tests updated mRNA COVID-19 vaccines designed to protect against new virus variants. About 1,144 adults and children who have already been vaccinated will receive one of four vaccine formulas. Researchers will measure how well the vaccines boost immunity and monitor fo…

This early-stage trial tests two versions of a nasal spray vaccine called COV2, designed to protect against COVID-19. About 20 healthy adults who have already had at least two COVID-19 shots will receive two doses of the nasal vaccine. The study checks for side effects and measur…

This study watches how the immune system changes over time in 200 adults with COVID-19 who are in the intensive care unit. Researchers take blood samples to measure immune markers and see how they relate to severe lung problems, infections, or death. No new treatments are given—t…

This study compares how the brain controls reproductive hormones in people with and without Long COVID. Participants receive a single dose of kisspeptin, a natural hormone, and researchers measure hormone levels through frequent blood draws. The goal is to understand if Long COVI…

This study follows 800 people who had COVID-19 to learn how long the virus can linger in different parts of the body, such as the nose, stool, semen, and breast milk. Researchers will also track how the immune system builds antibodies and any long-term health problems after infec…