Feb. 19, 2021
Pfizer vaccine may offer strong protection after first dose, Israeli study finds
The COVID-19 vaccine developed by Pfizer and BioNTech produces a robust immune response after just one dose, according to a new Israeli study of vaccinated health care workers at the country's largest hospital. It's also not clear how one dose will perform against different coronavirus strains that are becoming more widespread, including separate strains that were first reported in the U.K., South Africa and Brazil. "We're running into uncharted territory," said Deepta Bhattacharya, an associate professor of immunobiology at the University of Arizona, who was not involved with the study. "The uncertain issue is how long that protection is going to last against the current variants, as well as some of the ones that might get selected for if you wait too long."