Sewer sampling, the authors say, could be expanded to track other infectious diseases such as H5N1 avian flu or mpox or to detect unexpected pathogens.
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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Hospitalization rates are on an upward trend for all 3 viruses, with the highest levels for flu.
Eleven of the 15 deer tested positive for the virus in respiratory swab samples.
But flu vaccination wasn't tied to a reduction in key COVID-19 symptoms.
Eighty-seven percent of hospitalizations and 89% of resident deaths took place before widespread vaccination.
Flu hospitalizations are rising in all age-groups, with high or very high levels in 42 states.
The results demonstrate that the condition affects young people as well as old, the authors say.
Under 7% of dialysis patients are current with COVID vaccines, underscoring the need for antiviral treatments for patients with kidney disease.
Further tests found seasonal flu, rhinovirus, COVID, and other common respiratory viruses, alongside malaria and complications from malnutrition.
RSV activity remains high, with pediatric hospitalizations increasing across most of the country.
Three of every 4 patients did not return to prior health within 60 weeks of the initial infection.
