It has been a vexing question since the day Nadia was spotted dry coughing and wheezing in her enclosure at the Bronx Zoo.How in the world did the 4-year-old Malayan tiger contract covid-19, the disease that has infected about 1.4 million humans?Nadia is terribly unlucky — the first confirmed case of a wild or domesticated cat to come down with the disease. Her unlikely infection raised questions about whether humans can pass the coronavirus to their house pets. Zookeepers think Nadia got it from an infected human who was asymptomatic. In an interview Tuesday, Paul Calle, the zoo’s chief veterinarian, said they have no idea which human on the staff might have done it. “No one who has worked with these cats has been tested and is positive,” Calle said.As experts scratched their heads in New York, a study released this week by the University of California at Davis explored a broader problem related to human contact with wildlife. Manipulation of the environment by humankind, the study said, has made deadly pandemics inevitable.Hunting and domesticating wildlife, and also invading their habitats, allows the viruses animals carry to spill over, and — as Nadia’s infection suggests — vice versa. Gaming and

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