Covid cases in the U.S.: Against omicron, the vaccines' effectiveness for keeping people out of ERs and urgent care centers fell dramatically, to 38 percent 6 months after the second dose. A booster shot raised that level of effectiveness to 82 percent.When researchers looked specifically at patients who needed to be admitted to the hospital during the omicron surge, two shots were 81 percent effective.
Two additional studies, also published Friday by the CDC, suggest that boosters offered"significant protection" against both infection and symptomatic Covid, though that protection was higher during the delta surge compared with omicron. One of the studies, published in the CDC's Morbidity and Mortality Weekly Report, found that people who received three doses of an mRNA vaccine were more protected against infection, compared to people with only two doses. This was particularly true for people over age 50, the study found.
Another study, published in the Journal of the American Medical Association, found that three doses of an mRNA vaccine were more protective against symptomatic Covid, compared with people who were either unvaccinated or who had only received two shots.
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