Coronavirus disease 2019 (COVID-19) is caused by a virus that spreads between people. Find out how to protect yourself and those close to you.

We conducted a phase 2–3 double-blind trial to assess the efficacy and safety of nirmatrelvir–ritonavir in asymptomatic, rapid antigen test–negative adults who had been exposed to a household contact ...

Scientists searching for the origins of COVID-19 have zeroed in on a short list of animals that possibly helped spread it to people, an effort they hope could allow them to trace the outbreak back to ...

Find out how COVID-19 can affect dogs and cats, what you can do to protect your pet, and how to care for your pet if it becomes sick.

Despite frequent mentions of scientific evidence, U.S. media largely ignored uncertainties and relied on non-experts, fueling public confusion during the early COVID-19 crisis. In a recent study ...

Changes in the vaccine advisory process in the United States have disrupted immunization guidance, which reinforces the need for independent evidence review to inform decisions regarding immunization ...

The FDA has approved the first and only pill to prevent COVID-19 after exposure to the virus. Here's how it works. (Photo: ...