Any infectious diseases specialist would likely stress the importance of consistently monitoring influenza A H5N1, a significant global health threat. Since its identification in 1996, H5N1 has infected over 800 people with a mortality rate exceeding 50%. Since 2020, it has become endemic in bird populations and has triggered a large-scale animal pandemic, affecting at least 26 mammal species. While influenza strains often evolve and infect humans, human-to-human transmission of H5N1 remains rare.
Recent developments, including the unprecedented outbreak of H5N1 in dairy cows reported on March 25, 2024, in Texas, Kansas, and New Mexico, have raised concerns about potential cow-to-human transmission. Three human cases have been confirmed in the USA, all farm workers, with one presenting respiratory symptom. Genetic analysis indicates the virus is not well-adapted for human transmission but shows adaptation to mammalian hosts. Despite the low current risk to human health, calls for increased surveillance have been met with a slow response in the US, suggesting many cases may be undetected. This situation highlights the ongoing risks of zoonotic influenza and the need for vigilance and preparedness.1
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