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Understanding how animals become infected with COVID-19 can help control the pandemic

January 11, 2022
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Understanding how animals become infected with COVID-19 can help control the pandemic
A hippopotamus heads back into its enclosure at the Antwerp Zoo. (Shutterstock)

When veterinarians at the Antwerp Zoo noticed two hippopotamuses with runny noses, they didn’t just offer them tissues to blow their noses. They administered tests, which came back positive for COVID-19, the worldwide virus that has plagued the globe.

Since the start of the global pandemic almost two years ago, humans have not been the only species to contract the COVID-19 virus. Although the Belgian hippos were the first of their species to contract the virus, it has spread throughout the entire animal kingdom.

COVID-19 has revealed how health connects humans, animals and the environment — the approach that considers these relationships and connections is known as “One Health.”




Read more:
One Health: A crucial approach to preventing and preparing for future pandemics


Responding to the pandemic has been a model of One Health in action. Veterinarians, physicians and environmental experts have needed to collaborate to determine which species are susceptible to better understand how the COVID-19 virus spreads.

Table of Contents

  • Infected pets
  • Animals at risk
  • Animal vaccines
  • New viral diseases

Infected pets

In the early days of the COVID-19 pandemic — if you can remember that far back — alarming reports of pets infected with the COVID-19 virus raised unfounded fears regarding the potential exposure and risk of viral infections.

In April 2020, two cats from different households in different parts of New York state became the first domestic cats in America to contract the COVID-19 virus, followed several months later by the first positive British cat.

And although the first American dog to test positive for the COVID-19 virus died within a few months, his symptoms indicated he likely had cancer, suggesting that the virus may not have been the sole cause of his death. Although confirmed COVID-19 in pets is relatively uncommon, dogs and cats are at risk from catching the virus from an infected household member.

Conversely, however, and to great relief, overwhelming agreement has emerged among major veterinary societies that the risk of humans contracting COVID-19 from their dogs and cats is extremely low.

A VICE report on COVID-19 and pets.

Interestingly, an article in Scientific American reported on studies that showed that of the dogs and cats who lived in a household with a positive family member, one of every five of the pets had the virus, though symptoms were relatively mild.

Currently, there is no need for dogs and cats to be vaccinated, but pharmaceutical representatives are confident in their ability to readily produce a vaccine to protect pets.




Read more:
COVID: what happens if a far more lethal coronavirus emerges in pets?


Animals at risk

At the beginning of this pandemic, researchers were eager to discover the extent to which COVID-19 was transmittable from animals to humans, given the potential for animals to “spark new outbreaks.”

Early on, at least seven big cats — lions and tigers — at the Bronx Zoo tested positive for COVID-19. By the end of 2021, more than 300 animals representing 15 different species contracted COVID-19, including hyenas, lions, tigers, snow leopards, gorillas, otters and deer.

Recently, four snow leopards who contracted the disease from humans have died in American zoos.

Risks remain elsewhere in the animal kingdom. Captive gorillas, for instance, are highly susceptible to COVID-19. Were the disease to spread to gorillas in the wild, it would likely contribute to the depletion of the critically endangered species.

an adult lowland gorilla and two smaller ones in an enclosure
Nearly all of Zoo Atlanta’s Western lowland gorillas tested positive for the COVID-19 Delta variant in September 2021 after catching it from a zoo staff worker.
(AP Photo/Ron Harris)

Animal vaccines

If humans are not contracting COVID-19 from animals, why are scientists worried? After all, pets are more at risk from infected humans, and individuals who work closely with wild animals take appropriate precautions to prevent transmission. However, it is important to remember that animals are the likely source of the current pandemic: bats, in particular, carry a number of different coronavirus strains and are considered by many as the original carriers of SARS-CoV-2, the virus that causes COVID-19.

The transmission of the COVID-19 virus between humans and animals has been found in minks, a phenomenon that spread within mink farms in the United States and Europe. As a result, millions of minks have since been culled and there have been calls for banning mink farming.




Read more:
Wildlife trade poses health threats to humans, but Chinese wildlife farms are profiting


The most recent solution to human-animal transmission has been developing COVID-19 vaccines for animals. Because zoos are responsible for “often rare and high-value animals,” some have begun to vaccinate their residents.

New viral diseases

There are concerns that the COVID-19 virus has the potential to remain undetected in an animal and could mutate and become more infectious or dangerous to humans.




Read more:
COVID variants: could dangerous new ones evolve in pets and farm animals?


An estimated three of every four new infectious diseases in humans originated in animals — and this continues to worry scientists. Researchers worry about “zoonotic spillover,” the movement of diseases between animals and humans, given the increased risk of “infectious agents capable of jumping the species barrier.”

The current pandemic has been called “a wake-up call” for recognizing how the importance of One Health: a collaborative global vision committed to the health and well-being of humans, animals and the environment that can thwart future global health crises.

The Conversation

Beth Daly does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

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