Mayo Clinic Q&A: COVID-19 news update
Mayo Clinic Talks19 Touko 2022

Mayo Clinic Q&A: COVID-19 news update

This episode is shared from Mayo Clinic Q&A and was recorded in May 2022

Guest: Gregory A. Poland, M.D. (@drgregpoland)

Host: Halena M. Gazelka, M.D. (@hmgazelkamd)

The widespread availability of at-home COVID-19 tests have made it easier for people to know if they have the virus, and to take measures to protect themselves and others. But there is a downside. Because the majority of tests are now done at home and often not reported, the official counts on COVID-19 infection rates are not as accurate as they have been in past waves of the virus.

"Because the majority of testing is being done at home, we can no longer tell you accurately about the positivity rate for a given community for a given state like we used to be able to," explains Dr. Gregory Poland, head of Mayo Clinic's Vaccine Research Group. "And this is problematic. It means that we lose our ability to understand what's called genetic epidemiology — the ability to trace how these variants are moving, how fast they're moving, and whether they're changing and evolving into yet different subvariants or new variants. We've lost that ability now."

The most recent omicron subvariant, BA 2.12.1, has cases on the rise again and the U.S. passed a tragic milestone last week, reaching 1 million COVID-19 deaths in the country.

In an effort to capture a more accurate picture, the latest tool being used by public health officials to track COVID-19 infection rates is wastewater surveillance. By looking for the presence of the COVID-19 virus shed by people, wastewater surveillance can give a more accurate picture of how much virus is in the community. This detects virus not only from those who test at home, but also from people who are asymptomatic and, therefore, didn't get tested.

On the Mayo Clinic Q&A podcast, Dr. Poland discusses the current state of COVID-19 in the U.S., including what we know about the latest subvariants.

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