Dennis J Cunningham, MD

As COVID-19 vaccines are being approved for use, new strains of COVID-19 are appearing--which could reduce the effectiveness of the vaccines. Here's what to know in the race to end the pandemic.

Three COVID-19 vaccines have received emergency use authorization from the FDA. Here, what you need to know about each one.

More than a year into the pandemic, there are still rumors that are downplaying the seriousness of COVID-19. An expert sets the record straight.

The number of people who are vaccinated plus the number of people who have natural immunity could add up to herd immunity, but it's tricky to calculate.