A CDC study found H5N1 bird flu antibodies in 2% of veterinarians, indicating possible undetected infections among those working with livestock. This suggests, alongside recent cases, that current surveillance might not capture all cases of avian influenza transmission to humans. Researchers emphasize the need for enhanced monitoring, especially as risks may extend beyond reported outbreaks. While the public health risk remains classified as low, experts urge caution and improved protective measures for veterinarians and farm workers.