Flights from Asia played a larger role in disease spread than those from other countries, the study found.
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 protection against infections peaked at 4 weeks after vaccination.
Immunocompromised adults and children should receive an age-appropriate COVID-19 vaccine dose as soon as possible, the organization says.
The vaccines appear to sensitize tumors to cancer patients' immune checkpoint inhibitors, the researchers say.
No increased risk of congenital abnormalities was seen overall, by organ system, or for any of the 75 individual defects studied.
The Global Preparedness Monitoring Board says countries need to bolster primary healthcare systems, establish a pandemic risk monitoring system, and strengthen cooperation.
The excess risk was primarily seen among COVID-19 survivors who were hospitalized for their infections.
The vaccine was tied to lower risks of the outcomes among all age-groups, regardless of major underlying medical conditions and immune status.
But there is 'substantial opportunity' for load-balancing strategies during future pediatric hospital surges to reduce bed strain and harm, the authors say.
The CDC recommends that toddlers receive the varicella (chickenpox) vaccine as a standalone immunization.
In contrast, the condition affected less than 1% of the Swedish population before the pandemic.
