Study finds boosters give good protection against Omicron hospital cases
A US study of almost 17,000 patients finds modest two-dose Pfizer COVID vaccine effectiveness (VE) against hospitalization and emergency department (ED) admission for Omicron BA.1 (the original Omicron variant) and the BA.2 subvariant, but three-dose VE was 79% and 71% for hospitalization, respectively, and 72% and 21% for ED visits.