An open question is how long the current COVID-19 vaccines will offer protection against the virus. Will they provide lifelong protection like some vaccines, such as polio, or seasonal, like influenza? It’s largely an open question simply because the vaccines haven’t been in existence long enough to give a definitive answer.
However, the current Phase III trial of the Pfizer-BioNTech COVID-19 vaccine has confirmed the protection remains high for at least six months after the second dose. In a statement, Pfizer and BioNTech reported the vaccine, BNT162b2, was 91.3% effective against the disease, measured seven days through up to six months after the second dose.