COVID-19 infection rates and vaccine trials
A CDC study says true COVID-19 rates were more than 10 times higher than reported cases in most U.S. regions from late March to early May. Also, new research suggests that antibodies the immune system makes to fight the new coronavirus may only last a few months in people with mild illness.
CHICAGO (AP) - Reported coronavirus cases vastly underestimate the true number of infections, U.S. government data published Tuesday suggest, echoing results from a smaller study last month.
The Centers for Disease Control and Prevention study says true COVID-19 rates were more than 10 times higher than reported cases in most U.S. regions from late March to early May. It is based on COVID-19 antibody tests performed on routine blood samples in 16,000 people in 10 U.S. regions.
The study likely detected infections in people who may have had no symptoms or only mild illness, and who never got coronavirus tests. Infection rates were from six times higher than reported cases in Connecticut to 24 times higher in Missouri.
Still, most people in the 10 regions had not been infected.
The study was published online in JAMA Internal Medicine.
From the Abstract: Sites of collection were San Francisco Bay area, California; Connecticut; south Florida; Louisiana; Minneapolis-St Paul-St Cloud metro area, Minnesota; Missouri; New York City metro area, New York; Philadelphia metro area, Pennsylvania; Utah; and western Washington State.
Vaccine human challenge trials
Human trials of coronavirus vaccine candidates involve volunteers knowingly exposing themselves to a virus that has killed more than 300,000 people worldwide.
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