Sumathi Reddy

Three weeks is the recommended interval between the first two doses of Pfizer’s Covid-19 vaccine in the U.S., and four weeks for Moderna. But a longer wait could provide more protection, studies suggest.

With Thanksgiving gatherings and travel ahead for many, there are science-backed answers for when to time the shot for optimal protection.

Some parents who have held back on resuming normal activities until their kids get vaccinated have big plans now.

Here’s what the latest research as well as doctors and patients say about the condition.

What are you supposed to make of the flurry of news on mixing and matching Covid-19 vaccines? Here’s what the science says on how to know which combinations are best for you, and other considerations.

Influenza is expected to return in full force this season. Doctors say getting a Covid-19 shot can be a good opportunity to also get a flu shot: “The immune system can handle it.”

The latest research suggests that vaccinations help reduce the likelihood of developing longer-term symptoms after a Covid-19 infection and may help some people with symptoms feel better.

Rapid tests are in high demand. Here’s what to know about doing them at home, how long results take and how accurate they are.

The CDC’s backing extra shots for some people, but not all, has left many with more questions than answers.

Rapid Covid-19 antigen tests are a hot commodity this fall, with some schools and employers using them in an effort to reduce transmission and quarantine times. Here’s what you need to know about how to use them and how reliable they are.