COVID Vaccine

The Serbian tennis star says he understands he may miss the French Open and Wimbledon as a result. He adds that his decision is personal and he shouldn't be lumped in with anti-vaccination activists.

Brigham and Women's Hospital in Boston said the COVID-19 vaccine is one of several immunizations required by most U.S. transplant programs.

Now, both the Pfizer and the Moderna booster shots can be given five months after the second dose of vaccine — down from six months.

The new research affirms what many individuals had reported. But it also shows the changes to the menstrual cycle are mostly minor and brief, more akin to a sore arm than a dangerous reaction.

The program called COVAX was set up to make sure that all countries have access to COVID vaccines. Two key public health figures talk about what went wrong — and how to fix it.

Vaccines still do a solid job at warding off hospitalization from omicron. So if you're young and healthy, why get a booster? Scientists explain how boosters help and the best timing to get one.

Vaccine and booster side effects can include fever, aches and fatigue. And this may be the first vaccine in history where people complain if they don't experience side effects, says one doctor.

The second time Vanessa Quintero's family caught the virus, probably from her 8-year-old daughter, fewer people got sick. They and their doctors credit the protection of vaccination.