The odds of a respiratory tract infection and any infection were lower in the SARS-CoV-2 group.
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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In another study, researchers found that COVID-19 vaccine incentives didn't increase vaccine uptake.
Hospitalizations are also rising, but not nearly as steeply as cases.
The president also promised to ease testing shortages, as kids' illnesses and hospitalizations add to surging case numbers.
Another study found the breast milk of vaccinated mothers may protect infants for 6 months.
In other global developments, lockdown measures were added for cities in India and China, as Australia's cases and hospitalizations reached new record levels.
Nonhospitalized patients who recovered from asymptomatic to mild COVID-19 can experience small but measurable drops in dynamic lung volume, Danish researchers reported yesterday in the Journal of Infectious Diseases. They note that lower lung function, even within the normal ranges, is a risk factor for higher respiratory morbidity and mortality.
In other COVID developments, federal officials cleared two more rapid tests for emergency use as the weekly case average soared higher.
The adverse effects findings were similar to what preauthorization trials found for younger kids, and the real-world study in adolescents found substantial protection.
In other developments, countries affected earlier by Omicron reported more record cases, as Israel announced fourth doses for higher risk groups.
As officials brace for more post-holiday spread, studies yield promise for boosters and immune system response.
