What is the risk of H5N1 transmission from animals to humans in Vietnam?

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Forty-seven tigers, three lions, and a panther died in two zoos in southern Vietnam between August and September due to the H5N1 bird flu virus. These fatalities were confirmed by test results from the National Centre for Animal Health Diagnosis, identifying the cause as the H5N1 type A virus. While no zoo staff members in close contact with the affected animals reported respiratory symptoms, the World Health Organisation (WHO) has noted an increase in deadly outbreaks among mammals caused by influenza viruses, including H5N1, since 2022.
Animal Fatalities at Zoos

The H5N1 virus was responsible for the deaths of 47 tigers, three lions, and one panther across two facilities in southern Vietnam. These incidents occurred at the My Quynh safari park in Long An province and the Vuon Xoai zoo in Dong Nai during August and September. Official test results confirmed H5N1 type A virus as the cause of death for these animals.
Human Infection Potential

While the direct transmission risk from these specific zoo animals to humans in Vietnam remains unquantified in the provided information, the World Health Organisation (WHO) has indicated that H5N1 infections can manifest with varying severity in humans, ranging from mild to potentially fatal. Vietnam did report a human fatality from the virus to the WHO in March.
Broader Mammalian Outbreaks

Globally, the WHO has observed a rise in severe outbreaks of influenza viruses, including H5N1, affecting mammals since 2022. This trend highlights a broader concern regarding the adaptability and spread of these viruses within mammalian populations, which could have implications for interspecies transmission.
Absence of Staff Symptoms

Despite the significant number of animal deaths from H5N1 at the involved zoos, no zoo staff members who had close contact with the sick or deceased animals exhibited respiratory symptoms. This observation, as reported by the official Vietnam News Agency (VNA), suggests that either the exposure level was insufficient to cause infection in humans under these circumstances or that other mitigating factors were present.

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What is the risk of H5N1 transmission from animals to humans in Vietnam?

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