Cats, but not dogs, vulnerable to COVID-19

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Cats can become infected with the new coronavirus but dogs appear not to be vulnerable, according to a study by researchers at the Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China’s National Institute for Viral Disease Control and Prevention, and the National High Containment Laboratory for Animal Diseases Control and Prevention, prompting the World Health Organisation (WHO) to say it will take a closer look at the transmission of the virus between humans and pets.

Polity reports that the study found that ferrets can also become infected with SARS-CoV-2, the scientific term for the virus that causes the disease COVID-19. The report says the findings support an earlier study by Hong Kong’s Agriculture, Fisheries and Conservation Department that pet cats, and even some dogs, can host the disease. The Hong Kong study, however, said cats and dogs cannot pass the new coronavirus to humans, even if they can test positive for low levels if they catch it from their owners.

The report says the study was aimed at identifying which animals are vulnerable to the virus so they can be used to test experimental vaccines to fight the coronavirus pandemic, which has so far killed more than 88 000 people around the world since it emerged in China late last year.

The disease is believed to have spread from bats to humans. There have been a handful of reported infections in cats and dogs, but no strong evidence that pets can be carriers. The study, based on research conducted in China in January and February, found cats and ferrets highly susceptible to the virus when researchers attempted to infect the animals by introducing viral particles via the nose. They also found cats can infect each other via respiratory droplets. Infected cats had virus in the mouth, nose and small intestine. Kittens exposed to the virus showed significant lesions in their lungs, nose and throat. “Surveillance for SARS-CoV-2 in cats should be considered as an adjunct to elimination of COVID-19 in humans,” the authors wrote. In ferrets, the virus was found in the upper respiratory tract but did not cause severe disease.

Antibody tests showed dogs were less likely to catch the virus, while inoculated pigs, chickens, and ducks were not found to have any strain of the virus.

“It’s both interesting and not terribly surprising in the sense that with the original SARS epidemic, civet cats were implicated as one of the vectors that may have transmitted virus to humans,” Daniel Kuritzkes, head of infectious diseases at Boston‘s Brigham and Women’s Hospital is quoted in the report as saying.

The WHO said it is working with its partners to look more closely at the role of pets in the health crisis. Based on the evidence so far, WHO epidemiologist Maria Van Kerkhove said: “We don’t believe that they are playing a role in transmission but we think that they may be able to be infected from an infected person.” The WHO’s top emergencies expert Mike Ryan asked people not to retaliate against animals over the outbreak. “They’re beings in their own right and they deserve to be treated with kindness and respect. They are victims like the rest of us,” he said.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes the infectious disease COVID-19, which was first reported in Wuhan, China in December, 2019. Despite the tremendous efforts to control the disease, COVID-19 has now spread to over 100 countries and caused a global pandemic. SARS-CoV-2 is thought to have originated in bats; however, the intermediate animal sources of the virus are completely unknown. Here, we investigated the susceptibility of ferrets and animals in close contact with humans to SARS-CoV-2. We found that SARS-CoV-2 replicates poorly in dogs, pigs, chickens, and ducks, but ferrets and cats are permissive to infection. We found experimentally that cats are susceptible to airborne infection. Our study provides important insights into the animal models for SARS-CoV-2 and animal management for COVID-19 control.

Jianzhong Shi, Zhiyuan Wen, Gongxun Zhong, Huanliang Yang, Chong Wang, Baoying Huang, Renqiang Liu, Xijun He, Lei Shuai, Ziruo Sun, Yubo Zhao, Peipei Liu, Libin Liang, Pengfei Cui, Jinliang Wang, Xianfeng Zhang, Yuntao Guan, Wenjie Tan, Guizhen Wu, Hualan Chen, Zhigao Bu

Full Polity report

Science journal abstract

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