Over time, as millions of people received doses, experts gained more knowledge about the COVID-19 vaccine. They were able to look at whether the timing of vaccine administration was an issue, explains David Souleles, MPH, director of the COVID-19 Response Team at the University of California, Irvine. “There are no timing concerns now,” he says. … [Many people are] wondering if they should get their flu shot first and then get a COVID booster, or if they should get a COVID booster first and then get a flu shot. “They should actually do both,” says Jonathan H. Watanabe, PharmD, PhD, associate dean of assessment and quality and professor of clinical pharmacy at the University of California, Irvine.