A case of the new coronavirus severe acute respiratory syndromecoronavirus 2(SARS-CoV-2) infection transmitting from a human to a domestic cat was reported on March 27, 2020 in Belgium. Cases of SARS-CoV-2 infection being transmitted from owners to their dogs have also been reported. For the first time, however, a case of SARS-CoV-2 transmission from a human to a domestic cat has been confirmed. A tiger kept at a zoo in New York was also reportedly infected with SARS-CoV-2; it is believed that the virus was transmitted to the tiger from infected caretakers. Therefore, we examined the homology of the angiotensin-converting enzyme2 (ACE2) molecule, a receptor for the spike glycoprotein on the virionsurface of SARS-CoV-2, between humans, dogs, cats, and other mammals. We found that the binding region of theACE2 molecule with the SARS-CoV-2 spike glycoprotein has high homology between humans, dogs, cats, tigers, and other mammals. Although the transmission of human coronavirus to petsor animals is rare, SARS-CoV-2 transmission from animals or pets to humans have not yet been demonstrated. The Belgian Health Service considers zoonotic infection as a special case. However, the Belgian Health Service has suggested individuals with SARS-CoV-2 to also avoid contact with pets or other animals.
ACE2, Binding region, COVID-19, Severe acute respiratory syndrome coronavirus 2
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