Tiger tests positive for coronavirus at Bronx Zoo,
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"There doesn't appear to be, at this time, any evidence that suggests that the animals can spread the virus to people or that they can be a source of the infection in the United States," Dr Jane Rooney, a veterinarian and a USDA official, said in an interview.
The USDA said on Sunday it was not recommending routine coronavirus testing of animals, in zoos or elsewhere, or of zoo employees.
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Still, Dr Rooney said a small number of animals in the US had been tested through the USDA's National Veterinary Services Laboratories, and all those tests came back negative except Nadia's.
The coronavirus outbreaks around the world are driven by person-to-person transmission, experts say.
According to data from Johns Hopkins University, the US has a total of 337,072 confirmed cases, and 9,619 deaths with the majority being in New York City.
There have been a handful of reports outside the US of pet dogs or cats becoming infected after close contact with contagious people, including a Hong Kong dog that tested positive for a low level of the pathogen in February and early March
Hong Kong agriculture authorities concluded pet dogs and cats could not pass the virus to human beings, but could test positive if exposed by their owners.
Some researchers have been trying to understand the susceptibility of different animal species to the virus, and to determine how it spreads among animals, according to the Paris-based World Organisation for Animal Health.
The American Veterinary Medical Association and the Federal Centres for Disease Control and Prevention (CDC) have been recommending out of an abundance of caution, people ill with the coronavirus should limit contact with animals.
In general, the CDC also advises people to wash their hands after handling animals and do other things to keep pets and their homes clean.