Learn what we do and don't know about REGN-COV2, Regeneron's antibody cocktail, including how stem cells were involved in the production of the drug.

Learn about the CD20 antigen, where it's found, and how it guides the treatment of lymphomas with monoclonal antibodies.

Rather than testing for antibodies, as done with adults, doctors test for the actual presence of HIV in infants using qualitative viral assays.

HIV is diagnosed with tests that look for the virus, antibodies, or antigens. Learn more about HIV testing and what results mean.

Herpes blood tests look for antibodies produced by the immune system in response to the herpes simplex virus. Learn how they differ.

Donated convalescent plasma has successfully cured one immunodeficient patient of a months-long battle with severe case of COVID-19.

A new study found that 25% of blood cancer patients will not develop antibodies after getting a COVID-19 vaccine. Here's why they should still get vaccinated.

Self-testing for HIV is quick and easy. Learn more about your options when it comes to at-home HIV tests and find out what to expect before you choose.

Learn who can be treated with Regeneron's antibody cocktail, REGN-COV2, as well as how it's intended to work.