According to a study, healthcare workers who received a fourth dose of the messenger RNA vaccine from Pfizer Inc. were significantly less likely to get COVID than their triple-vaccinated counterparts.
The results, which were released on Tuesday in the American Medical Association, are the most recent to show the advantages of a second booster against Omicron breakthrough infections. The authors of the study proposed that an additional dose might be utilized to prevent medical staff shortages and preserve healthcare systems in emergency situations.
The study was conducted in Israel, where a quick vaccination programme gave researchers access to actual data on vaccination effectiveness. The US is currently deciding whether to expand eligibility for second booster shots in light of the introduction of the BA.5 Omicron mutation.
After receiving their fourth mRNA shot in January, physicians, nurses, and other healthcare professionals had a 7% probability of contracting a fresh infection. A 20% infection incidence was seen in those who received three doses, the third of which was given by the end of September.