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Vaccine efficacy ranged from 69.5% against symptomatic infection to 78.8% against moderate-to-severe disease.
Individuals with breakthrough infection have an increased risk for death and postacute sequelae compared with contemporary controls.
The rate suggests there were more than 650,000 omicron infections in the United States last week.
Secondary infection risks were lower for primary cases aged 12 to 17 years compared with those aged 18 to 49 years.
An association was found for Alzheimer’s and Parkinson’s disease cases diagnosed before 60 years of age.
Symptomatic and asymptomatic infection was reduced by 81% after partial vaccination and by 91% after full vaccination
The new testing initiative would provide Americans with new antiviral medications as soon as they learn they are infected.
The pooled percentage of asymptomatic infections was higher in nursing home residents and staff, air and cruise travelers, and pregnant women.
Increases in resistant infections from 2019 to 2020 were seen for carbapenem-resistant Acinetobacter, antifungal-resistant Candida auris.
The study showed that 12 of 12 healthcare workers who received a diagnosis of SARS-CoV-2 infection had at least mild symptoms.