LOS ANGELES -- U.S. regulators issued new guidance this week shortening the time that people who received Moderna or Pfizer's COVID-19 vaccine have to wait for a booster, and it's different than the ...

Some people vaccinated against COVID-19 initially acquire strong levels of neutralizing antibodies but then experience rapid declines. Measuring immunoglobulin A antibody titers post-vaccination could ...

Some people are worried that another Covid surge is coming, powered by omicron's highly contagious BA.2 subvariant. But experts say a significant jump in cases is unlikely, at least for now — possibly ...

Respiratory germs like RSV and Strep A surged across the world after Covid mitigation measures eased. Scientists in New Zealand blame waning antibody levels. Antibody responses in 150 regular blood ...

SAN FRANCISCO -- There's reassuring news for pregnant women who are unsure if they should get the vaccine. A partially vaccinated mother gave birth to a healthy baby girl with COVID antibodies and, ...