text:  Officials say levels of COVID-19 in the San Francisco Bay Area are trending upward. Nadia Roan, a professor at UC San Francisco, says people can better protect themselves by keeping up with their booster shots. If you're elderly or immunocompromised, you can end up with severe COVID. You can end up in the hospital and you can even end up dying from COVID. Now for individuals that are young, that have a generally healthy immune system, I would say it's still important to boost immunity.