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Wastewater reveals which viruses are actually circulating and causing colds

STEVE INSKEEP, HOST:

As the weather cools down, as it has here in Washington, people head indoors and start spreading viruses more efficiently. NPR's Pien Huang reports on the viral stew.

PIEN HUANG, BYLINE: There's the big three, to start - flu, RSV and COVID. Those are the ones health officials, like the CDC's Dr. Demetre Daskalakis, are talking about the most.

DEMETRE DASKALAKIS: These are the three that really cause the most sort of utilization of the health care system and the most severe disease.

HUANG: Last year, a survey by the health policy nonprofit KFF showed that 40% of households were hit with at least one of these three viruses. But Marlene Wolfe, an epidemiologist at Emory University, says there's more in the respiratory viral stew.

MARLENE WOLFE: There's always something else in the mix.

HUANG: Things like rhinoviruses and non-COVID coronaviruses, both causes of the common cold. There are parainfluenzas, which can cause croup and pneumonia in children, and an enterovirus, which caused a national outbreak 10 years ago. And then there's human metapneumovirus.

WOLFE: That's a pretty new virus, actually, that was identified in the early 2000s - looks quite similar to RSV a lot of the time in clinical presentation.

HUANG: Wolfe says data from wastewater shows that human metapneumovirus actually circulated a lot last winter. It could've been the fourth virus added to the tripledemic mix.

A lot of these viruses have the same cold- and flu-like symptoms - coughing, sneezing, fevers, chills.

WOLFE: Most people who are infected with all of these viruses will recover and be completely fine. But it's important for us to understand what is circulating so that we can know how to use the interventions that are available to us.

HUANG: Wolfe leads WastewaterSCAN, a program that provides a granular, real-time look at pathogens.

It's still early in the season. So far, data shows there are mid levels of COVID going around and low levels of everything else. To Dr. Daskalakis from CDC, that means it's a good time to get protected.

DASKALAKIS: We have a new updated COVID vaccine. We have updated flu vaccines.

HUANG: For older people and pregnant people, there are vaccines for RSV and preventive shots for newborns. The CDC expects this virus season to be similar to the last - better than the height of the pandemic, but worse than the years before it.

Pien Huang, NPR News.

(SOUNDBITE OF MUSIC) Transcript provided by NPR, Copyright NPR.

NPR transcripts are created on a rush deadline by an NPR contractor. This text may not be in its final form and may be updated or revised in the future. Accuracy and availability may vary. The authoritative record of NPR’s programming is the audio record.

Pien Huang is a health reporter on the Science desk. She was NPR's first Reflect America Fellow, working with shows, desks and podcasts to bring more diverse voices to air and online.

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