New data from the Centers for Disease Control and Prevention show booster shots of the Pfizer-BioNTech and Moderna vaccines were highly effective at preventing omicron-related hospitalizations. The booster doses were 90% effective at keeping people infected with the omicron variant out of the hospital and 82% effective at preventing emergency department and urgent care visits, the data shows. The CDC report analyzed emergency room visits, urgent care visits and hospitalizations between August 2021 and Jan. 5, 2022, in which the average person received their booster shot within a month and a half of needing medical help. The data emphasizes recent research and assertions by public health officials that boosters significantly prevent severe illness and hospitalization.