![]() ![]() This lower effectiveness is likely due to the combination of decreasing protection as time passes since getting vaccinated, as well as the greater infectiousness of the Delta variant.ĭata from small clinical trials show that vaccine effectiveness against COVID-19 infection is waning after the primary series, but protection remains high against severe disease and hospitalization. Studies show after getting vaccinated against COVID-19, protection against the virus and the ability to prevent infection with the Delta variant may decrease over time.Īlthough COVID-19 vaccination for older adults remains effective in preventing severe disease, recent data suggest vaccination is less effective at preventing infection or milder illness with symptoms over time.Įmerging evidence also shows that among healthcare and other frontline workers, vaccine effectiveness against COVID-19 infection is also decreasing over time. ![]()
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