So far this season, 101 children have died of flu, roughly 85% of whom were unvaccinated.
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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Full vaccination and a booster dose reduced the risk of preeclampsia by 15% and 33%, respectively, the authors estimate.
Children with the condition are also more likely to have severe infections, the study suggests.
Positive samples were significantly more common in the emergency department than in intensive care.
Hospitalized and non-hospitalized COVID patients were 41% and 33%, respectively, more likely to be diagnosed as having apnea than uninfected controls.
Elevated risk was not seen among people who were partially or fully vaccinated.
Flu, respiratory syncytial virus, and COVID-19 levels still elevated in some parts of the country.
Conversely, anxiety and depression were seen less frequently.
The discovery will allow vaccine developers to avert the disorder by adjusting the adenovirus protein in the vaccines, the authors say.
No similar link found between infection and impaired fertility in females, new review suggests.
The perceived safety of the MMR vaccine is now 83% (down from 86%).