With a new wave of COVID-19 infections fueled by the Delta variant striking countries worldwide, disease experts are scrambling to learn whether the latest version of coronavirus is making people - mainly the unvaccinated - sicker than before.
The U.S. Centers for Disease Control and Prevention warned that Delta, first identified in India and now dominant worldwide, is "likely more severe" than earlier versions of the virus, according to an internal report made public on Friday.
But the experts said more work is needed to compare outcomes among larger numbers of individuals in epidemiologic studies to sort out whether one variant causes more severe disease than another. Delta is as contagious as chickenpox and far more contagious than the common cold or flu, according to the CDC report.
For vaccinated, otherwise healthy individuals, the odds are that if they contract COVID-19 they will only experience asymptomatic or mild disease, said Dr. Gregory Poland, infectious disease expert at the Mayo Clinic. Research from China suggesting that the Delta variant replicates much faster and generates 1,000 times more virus in the body compared to the original strain highlights the biggest danger of this new wave, Barron said.
"We are seeing more patients requiring oxygen sooner," said Dr. Benjamin Barlow, chief medical officer at American Family Care, a 28-state chain of urgent care clinics.
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