Adrianna Rodriguez, USA TODAY Published 5:00 a.m. ET Jan. 5, 2021 | Updated 2:48 p.m. ET Jan. 5, 2021CLOSE Vaccinologist Dr. Greg Poland discusses what it’s like after your first dosage of COVID-19 vaccine. USA TODAYIt’s still possible to test positive for the coronavirus even after getting vaccinated, experts said.Both the Pfizer-BioNTech and Moderna vaccines require two doses per patient to be fully effective. The first Pfizer-BioNTech dose is more than 50% effective in preventing COVID-19, and the second dose increases that protection to about 95%.The Centers for Disease Control and Prevention said it can take weeks for a person’s body to build up immunity after getting vaccinated.“That means it’s possible a person could be infected with the virus that causes COVID-19 just before or just after vaccination and get sick,” the agency said. “This is because the vaccine has not had enough time to provide protection.”Nicole Iovine, an infectious disease expert and hospital chief epidemiologist at University of Florida Health, said it takes the average person 10 to 14 days to build up a protective number of antibodies, but each person is different.“Every day that goes by, the chance you get infected goes down a little bit,” she said.

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