New studies on vaccine efficacy against Delta, kids’ noses have more immunity

The COVID-19 vaccines available in the United States are still highly effective at preventing hospitalization but their effectiveness against new infections has decreased as the Delta variant spread, according to new studies published on Wednesday in Morbidity and Mortality Weekly Report. None of the studies could tell whether the breakthrough infections were due to waning immunity, reduced protection against the Delta variant, or a combination of factors. – Vaccine effectiveness against any SARS-CoV-2 infection – mild or severe – dropped to 53.1% in late June to early August, from 74.7% before Delta became predominant, according to a study of U.S. long-term care facilities


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