The risk of long COVID was two to three times higher after the initial infection (14.8%) than after first (5.8%) or second (5.3%) reinfections.
Plaque growth can lead to a higher risk of heart attack, stroke, and other life-threatening cardiovascular events for as long as 1 year.
Post-exertional malaise, or exercise intolerance, was seen in 36% of those with long COVID.
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Overall, 75% of studies included for review showed an increase in the number of incident cases of type 1 diabetes during the first 12 months of the pandemic.
Subgroup analysis found significant benefits for patients with cancer, cardiovascular disease, or both.
Hospitalization rates for COVID declined further, as did emergency department visits, and deaths held steady at a low level.
The findings could help in the structure-based design of pan-coronavirus vaccines and therapies, the authors say.
Sampling suggested that Omicron COVID-19 cases were up to 19 times higher than reported because of changes in clinical testing.
A single-center study in Canada finds a low incidence of bacterial infections in infants with viral infections, including SARS-CoV-2.
Hospitalization and deaths are becoming more accurate markers, as countries scale back on testing and case reporting.
Moreover, the study shows the spike protein's affinity for type A cells may be amplified by the Omicron strain of the virus.
Scientists find 4 species of coronaviruses, including 2 novel ones, in UK bats, but experts say they pose little risk to people.
More than 1 million COVID-19 cases were confirmed in Hong Kong when Omicron swept through a largely immune-naïve population.