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No significant reduction was seen in the risk for symptomatic SARS-CoV-2 infection with postexposure prophylaxis for five or 10 days.

The authors say, however, that the risk remained substantial, even among vaccinated persons during the omicron era.

Hospital-onset SARS-CoV-2 remained associated with increased morbidity and mortality during the omicron era.

An increased likelihood was seen for female physicians, older physicians, and trainees, and for emergency department doctors.

Before the COVID-19 pandemic, the rate of older adults living with dementia was decreasing. The pandemic accelerated that decline, however, due to an increase in deaths among older adults living with dementia,...

Female sex and preexisting cardiovascular disease were tied to longer recovery times.

The risk for death remains significantly elevated in the third year, as is risk for incident postacute sequelae of COVID-19.

Each 1-degree Celsius increase in skin temperature after a dose was linked to a 1.8- and 3.1-fold higher neutralizing antibody response one and six months later.

The findings based on symptoms at 10 weeks following 15-day course in vaccinated cohort.

Reasons why doses may be marked as wasted include a cracked vial, an error diluting the vaccine or a freezer malfunction.