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The finding suggests human cases of H5N1 are going undetected. Moreover, managing to find evidence of two undetected infections in a sample of just 14 workers suggests it may not be hard to find more. The Centers for Disease Control and Prevention estimates that around 200,000 people work with livestock in the US.

https://arstechnica.com/science/2024/08/troubling-bird-flu-study-suggests-human-cases-are-going-undetected/