Nadia, a 4-year-old female Malayan tiger at the Bronx Zoo, that the zoo said on April 5, 2020 has tested positive for coronavirus disease (COVID-19) is seen in an undated handout photo provided by the Bronx zoo in New York. A tiger at the Bronx Zoo in New York City has tested positive for the respiratory disease caused by the novel coronavirus, in the first known case of a human infecting an animal and making it sick, the zoo's chief veterinarian said on Sunday (April 05). WCS/Handout via REUTERS

Ambulances go inside of the Bronx Zoo as the outbreak of the coronavirus disease (COVID-19) continues in the Bronx borough of New York City, New York, U.S., April 5, 2020. The virus that causes COVID-19 is believed to have spread from animals to humans, and a handful of animals have tested positive in Hong Kong. REUTERS/Eduardo Munoz

A drive-through testing site for the coronavirus disease (COVID-19) is seen closed inside of the Bronx Zoo as the outbreak of coronavirus disease (COVID-19) continues in the Bronx borough of New York City, New York, U.S., April 5, 2020. REUTERS / Eduardo Munoz

An ambulance goes inside of the Bronx Zoo as the outbreak of the coronavirus disease (COVID-19) continues in the Bronx borough of New York City, New York, U.S., April 5, 2020. REUTERS/Eduardo Munoz

A drive-through testing site for the coronavirus disease (COVID-19) is seen closed inside of the Bronx Zoo as the outbreak of coronavirus disease (COVID-19) continues in the Bronx borough of New York City, New York, U.S., April 5, 2020. REUTERS/Eduardo Munoz

A plastic glove is seen at the entrance of a drive-through testing site for the coronavirus disease (COVID-19) located inside of the Bronx Zoo as the outbreak of the coronavirus disease (COVID-19) continues in the Bronx borough of New York City, New York, U.S., April 5, 2020. REUTERS/Eduardo Munoz