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Stories by William Petri

Do I need a COVID-19 booster shot? 6 questions answered on how to stay protected

As of August 2021, the FDA and CDC recommend adding a third shot to the COVID-19 vaccination course for people who are severely immunocompromised, and microbiology/infectious disease specialist William Petri answers some questions about booster shots.... Read more»0

How effective is the first shot of the Pfizer or Moderna vaccine?

Two shots are better than one. While the Moderna and Pfizer mRNA vaccines weren’t designed specifically to ward off the delta variant of COVID-19, new research suggests a single dose provides less immunity against the coronavirus strains that are out there now than it did against the original strain. ... Read more»0