Fourth Shot of COVID-19 Vaccine Can’t Prevent Omicron Infection: Israeli Study

A woman receives a second Pfizer COVID-19 vaccine booster shot in Netanya, Israel on Jan. 5, 2022. Ammar Awad

A second booster shot of Pfizer’s COVID-19 vaccine induced antibodies but likely not at a level high enough to protect recipients against infection from the Omicron virus variant, Israeli researchers said Monday.

Sheba Medical Center has been studying 150 health care workers who received a second booster, or a fourth shot.