Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.

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 ...

Two health care workers get COVID-19 vaccinations on the same day. Both show strong antibody responses initially, but six months later one stays healthy while the other contracts the virus. A new ...

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 ...

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Two healthcare workers get COVID-19 vaccinations on the same day. Both show strong antibody responses initially, but six months later one stays healthy while the other contracts the virus. A new study ...

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 ...

A naturally occurring compound found in foods such as wheat germ, mushrooms, and aged cheese may help older adults build ...

Persistent symptoms after COVID-19 infection continue to affect millions of people worldwide, even as the number of acute infections has declined. Long COVID (LC) can cause fatigue, headaches, sleep ...