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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Officials say the rapid appearance in multiple countries in people without travel histories suggests established international spread.
Early during COVID-19, school closures were likely linked to a surge in mental health crises among 11- to 17-year-old adolescents.
The case incidence per 1 million person-days was 90 before the Delta variant, 304 during Delta, and more than 1,000 during Omicron.
Experts are watching impacts from viruses that have the F456L mutation, while tracking the emergence of the highly mutated BA.2.86 variant.
The risk of developing venous thromboembolisms is elevated among cancer patients with COVID-19 taking anticancer drugs, new data show.
Vaccine effectiveness of at least one bivalent dose of vaccine was 80% at a median of 58 days.
In another development, the ECDC added viruses with the F456L change, including EG.5, as variants of interest.
Nearly a third were affiliated with groups with a history of spreading medical misinformation, such as America's Frontline Doctors.
Rather than indoor-outdoor air exchanges per hour, the document describes an "equivalent clean air flow" target per occupant of pathogen-free air.
School shutdowns, increased screen time, and more access to low-quality food are some of the reasons previous research has cited for pandemic weight gain.
