Overall, 57% of participants had evidence on PET/MRI of inflammation affecting the heart or lungs.
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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The 30-day death rate was 5.97% for COVID-19 and 3.75% for flu, for an excess death rate of 2.23%.
The authors called for a clearer definition of long COVID so that evidence from clinical trials can be reliably applied to evidence-based clinical management.
In the two rare cases, babies had seizures at birth, microcephaly, and developmental delays over time.
The authors say neither a human nor animal origin can be ruled out.
The ECDC said though no clear seasonal circulation pattern has emerged, COVID's impact has been higher in the fall and winter.
The relative risks in some UK ethnic groups were higher earlier in the pandemic but shifted toward White, higher-income groups in a later wave.
The policy change would apply to those at highest risk, including people older than 65 and those with weakened immune systems.
The risk of hospitalization or death by 28 days was 4.6% among the 2,571 mAb recipients, compared with 7.6% among the 5,135 matched control patients (risk ratio, 0.61).
Taking substantial sick leave may be a proxy for long COVID, offering another data point for measuring the burden of the complication.
Though illness levels are declining in much of the world, they are on the rise in some countries including India and a handful of Middle East countries.
