With increasing time since diagnosis, only the severe infections continued to cause symptoms.
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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During follow-up, 3% of patients with postvaccination myocarditis, 4% of those with post-COVID myocarditis, and 6% of those with the conventional type were readmitted for myopericarditis.
The most common diagnosis was depression, a history of which was a risk factor for mental illness after COVID-19 infection.
US health officials are eying ways to reduce the spread of the virus over colder months and the holiday season.
The agency approved of the single-strain mRNA COVID-19 vaccines for people aged 12 and older and granted emergency use authorization for those aged 6 months to 11 years.
Absenteeism rates were 10.6 percentage points higher among students learning from home in districts in the top quintile of poverty than those receiving face-to-face instruction.
Its benefits in reducing symptoms or severity are unclear, the authors say.
The team found a modest but statistically significant higher relative risk of having gestational diabetes in those who had COVID during pregnancy.
The index is a step toward a tool that could someday be used to identify long COVID in children but is not ready for clinical use, the authors say.
In a proof-of-concept study, researchers used the technique to characterize the bacterial pathogen population at an Italian hospital during the early months of the COVID-19 pandemic.
A second study found good protection against hospitalization--although uneven uptake--among pregnant women.
