Pfizer COVID booster shown highly protective against severe illness, death
A pair of observational Israeli studies yesterday in theNew England Journal of Medicinefind that the Pfizer-BioNTech COVID-19 vaccine booster is highly protective, with one estimating much lower rates of infection and severe illness, and the other finding a 90% lower death rate.
Infections 10 times lower among boosted
In the firststudy, from Jul 30 to Oct 10, 2021, a period marked by dominance of the Delta (B1617.2) variant, a team led by scientists from the Weizmann Institute of Science in Rehovot analyzed data from the Israel Ministry of Health database. The study involved 4,696,865 residents 16 years and older who had received two doses of the Pfizer COVID-19 vaccine at least 5 months before enrollment.
Israel rolled out boosters in July 2021, first in residents 60 years and older and then to everyone 12 and older.
The researchers compared rates of COVID-19 infections, severe illness, and death among residents who had received a booster dose at least 12 days earlier with those who had not received one. They also conducted a secondary analysis in which they compared case, severe illness, and death rates among those who had receive a booster 3 to 7 days before enrollment (early postbooster group).