As you may have heard over the last few days, one tiger in the Bronx Zoo in New York City recently tested positive for Sars-Co-2 ( the virus that is causing Covid-19 illness in humnas). It really did. And that contradicts what we have generally thought about this corona virus.
I have spent a lot of time this week learning more about this situation in animals. This virus, Sars-Co-2, is new but the first one (Sars-Co-1) that caused SARS in early 2000s has been extensively studied in animals. First, animal get many corona viruses themselves. Dogs and cats have at least 3 that I have clinically seen, so they aren’t rare. They are as common as “the common cold”. Some cause respiratory symptoms, some cause gastrointestinal symptoms.
Researchers over the last 15 years have been seeing if the human Sars-Co-1 could infected animal species like dogs, cats, horses, and ferrets. It can. It rarely goes to dogs, occasionally to cats, and easily to ferrets. So it stand to reason that the new coronavirus could theoretically be transmitted to those species.
Tigers are in the same animal family as domestic cats. The Bronx Zoo cats were not in close proximity to a known infected human, but must have come in contact through the bars to an asymptomatic human zookeeper. One zookeeper noted that several cats has upper respiratory symptoms, and the decision was made to anesthetize ONE to test, out of an abundance of caution. So one tiger did test positive, and we assume all would have but weren’t tested.
So cats (all types) CAN contract the corona virus from humans. That is confirmed.
But can cats be carriers and spread it back to humans? That is the big question and several veterinary laboratories have been doing extensive ( >5000 tests) on cats, dogs, and horses worldwide since February to see if we have any positives in the population. All tests have been negative so far, and they think they have a very specific test. The test by Idexx isn’t available commercially where a vet like in me in private practice can order it, but if the situation changes, it might be.
So YES CATS CAN BE INFECTED from humans (reverse zoonosis), but we don’t believe them to be INFECTIOUS TO HUMANS.
We kind of already knew that after the 2 positive house cats in Europe (that were in households with sick humans) recently. Both of those cats has respiratory symptoms but neither required hospitalization.
Scarier still for my practice with ferrets, is that FERRETS are MORE susceptible to coronaviruses than cats.
In conclusion, if you are sick, stay away from your pets, especially cats and ferrets. Let someone else take care of them. And if we see a sick cat, we will assume it is a cat virus, keep it away from other cats, and maybe run some cat virus panels before we even think about Sars-Co-2.
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