And the canines are even better than PCR tests at identifying infected people with no symptoms. COVID19 pcrtest dogs COVIDTesting pandemic Science
A dog sniffs out sweat samples from symptomatic COVID-19 positive individuals as part of a study.
, similar to many at-home tests, but sometimes mistook another respiratory virus for the coronavirus, Grandjean and colleagues found. What’s more, anecdotal evidence suggests the dogs can pick up asymptomatic cases as much as 48 hours before people test positive by PCR, he says. Those results indicate that odors from multiple body sites can be used for canine screening, says Kenneth Furton, a forensic chemist at Florida International University in Miami who was not involved in the study.
It’s not clear exactly what dogs are smelling when they detect COVID-19 or other diseases, says Cynthia Otto, director of the University of Pennsylvania School of Veterinary Medicine’s working dog center, who was not involved in the study. It may not be a single chemical, but rather a pattern of increasing and decreasing levels of certain aromas. “It’s not like you could create an odor perfume bottle that would be the scent of COVID,” she says.
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