U.S. :Undercounted Covid-19 cases leave blind spot as BA.5 variant becomes dominant

The Omicron offshoot BA.5 became the dominant variant in the US last week, according to data from the US Centers for Disease Control and Prevention, and the subvariant carries key mutations that help it escape antibodies generated by vaccines and prior infection, aiding its rapid spread.

 

With that will come "escalating numbers of cases and more hospitalizations," Dr. Eric Topol, a cardiologist and professor of molecular medicine at Scripps Research, said on CNNi Monday. "One good thing is it doesn't appear to be accompanied by the ICU admissions and the deaths as previous variants, but this is definitely concerning."

But to look at official case counts, it's hard to tell.

The share of cases that are officially reported is at an "all-time low," said Dr. Michael Mina, an epidemiologist and chief science officer at telehealth company eMed. "There's no doubt about that."

 

Covid-19 cases have been undercounted to some degree throughout the pandemic for reasons including a lack of available tests at some points and asymptomatic cases that may have been missed. But as people increasingly rely on rapid at-home tests -- and as attitudes toward the pandemic shift overall -- the US hasn't landed on a reliable way to track transmission levels.

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