Could The Live Flu Vaccine Help You Fight Off COVID-19?

In case you were still procrastinating getting a flu shot this year, here's another reason to make it a priority.

There's a chance the vaccine could offer some protection against COVID-19 itself, says virologist Robert Gallo, who directs the Institute of Human Virology at the University of Maryland School of Medicine and is chairman of the Global Virus Network.

The key is getting the right flu vaccine, says Gallo, who was one of the main scientists credited with discovering HIV. "The vaccine has to have a live virus in it. The virus is attenuated so it doesn't cause disease, but otherwise the virus is alive."

A live virus may sound a bit terrifying, but it's a standard way to make safe and effective vaccines. In fact, you've probably already had a few "live, attenuated" vaccines in your lifetime, such as the measles vaccine or oral polio vaccine.

Now scientists are just beginning to learn that these vaccines may offer some unexpected advantages to the immune system.

When developing a vaccine, scientists have a few strategies to try. They can take a piece or component of the bacteria and use that to trigger an immune response in a person. They can kill the pathogen and use its corpse as the vaccine. Or they can take a live pathogen and weaken it in the lab.