With the Omicron variant dominant in the United States, vaccine effectiveness was 87% against Covid-19 emergency department or urgent care visits and 91% against hospitalizations in the two months …
By Jacqueline Howard | CNN
Evidence of waning protection “reinforces the importance of further consideration of additional doses to sustain or improve protection” against Covid-19-linked hospitalizatoions and emergency department visits,” the study says. The data showed that vaccine effectiveness against emergency department visits and hospitalizations was higher after the third dose than after the second dose but waned over time.
After just two doses of vaccine, when the Omicron variant was predominant, vaccine effectiveness against hospitalizations declined from 71% in the two months after vaccination to 54% by at least five months, the study found.Among recipients of three doses during the time Delta was dominant, vaccine effectiveness against Covid-19-associated hospitalizations declined from 96% within two months of vaccination to 76% at least months later.
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