Why did H5N1 virus kill dozens of big cats in Vietnam zoos?

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H5N1 Virus Caused Deaths of Dozens of Big Cats in Southern Vietnam Zoos

Dozens of big cats, including 47 tigers, three lions, and a panther, died in zoos in southern Vietnam between August and September due to the H5N1 bird flu virus. Test results from the National Centre for Animal Health Diagnosis confirmed the animals succumbed to the H5N1 type A virus. These incidents occurred at the My Quynh safari park in Long An province and the Vuon Xoai zoo in Dong Nai, near Ho Chi Minh City.
Confirmation of H5N1 as the Cause of Death

The National Centre for Animal Health Diagnosis conducted tests that definitively identified the H5N1 type A virus as the cause of the fatal outbreaks among the big cats. This finding was reported by the official Vietnam News Agency (VNA), which detailed the deaths occurring in August and September. The affected animals included 47 tigers, three lions, and one panther, all housed in facilities in the southern part of the country.
Locations of the Fatal Outbreaks

The fatalities were concentrated in two specific zoological facilities in southern Vietnam. The private My Quynh safari park, located in Long An province, and the Vuon Xoai zoo in Dong Nai province, which is situated near the major urban centre of Ho Chi Minh City, were identified as the sites of the H5N1 outbreaks. These locations are key centres for animal collections in the region.
Absence of Human Respiratory Symptoms Among Staff

Despite the significant mortality among the animal populations, zoo staff members who had close contact with the affected animals did not exhibit any respiratory symptoms. This observation suggests a lack of apparent transmission from the infected animals to humans within these specific zoo environments, at least among those with direct contact.
Broader Context of Mammalian H5N1 Infections

The World Health Organisation (WHO) has observed a general increase in reported deadly outbreaks of influenza viruses, including H5N1, among mammals since 2022. This trend highlights a growing concern regarding the virus's ability to affect a wider range of species beyond avian populations. Vietnam itself had previously notified the WHO of a human fatality attributed to the virus in March.

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Why did H5N1 virus kill dozens of big cats in Vietnam zoos?

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