As thousands of Pennsylvania's got their COVID-19 vaccinations on Saturday, Pfizer's CEO said he believes that a booster could be necessary.
KDKA's Jessica Guay has the details.
As thousands of Pennsylvania's got their COVID-19 vaccinations on Saturday, Pfizer's CEO said he believes that a booster could be necessary.
KDKA's Jessica Guay has the details.
Vaccine makers Moderna, Pfizer and J&J are working to come up with a booster shot that will help variants.
The United States is preparing for the possibility that a booster shot will be needed between nine to 12 months after people are..