Pfizer COVID-19 Vaccine Effectiveness Drops After 6 Months, Study Reveals
Vaccine effectiveness against the Delta variant was 93% after the first month, declining to 53% after four months… The effectiveness of the Pfizer COVID-19 vaccine in preventing infection by the coronavirus dropped to 47% from 88% six months after the second dose. This is according to a data published on Monday that US health agencies … Read more