The US hasn't seen a human bird flu case in 3 months. Experts are wondering why
Health officials are urging continued vigilance against H5N1 bird flu, but experts are puzzled by the recent drop in reported human cases. Since March 2023, the U.S. recorded 70 human infections, mostly among dairy and poultry workers, yet new cases have not been confirmed since February 2025. In California, testing has sharply declined&mdashfrom over 50 people tested monthly to none in May-raising concerns that cases, particularly mild ones, may be going undetected. Experts point to seasonality, reduced animal infections, and decreased surveillance as possible reasons for the decline.Concerns are growing that government budget cuts and staff resignations at key agencies like the USDA and FDA have weakened monitoring systems. Additionally, experts worry that immigrant farmworkers may be avoiding testing due to fears of deportation. Some say targeted surveillance has significantly dropped since the Trump administration, potentially leaving many mild or asymptomatic cases unreported. Meanwhile, researchers continue investigating, with studies underway on farmworkers and domestic cats, which are also being infected through raw milk or contaminated pet food.Despite the gaps, the CDC still considers the public risk low, though moderate for those in close contact with animals.Despite the gaps, the CDC still considers the public risk low, though moderate for those in close contact with animals. They continue to fund studies to understand exposure patterns and monitor potential pandemic threats. Scientists stress the importance of expanding surveillance, especially among animals like cats, which may serve as early indicators of virus transmission. Experts warn against complacency, emphasizing the need for stronger, proactive monitoring efforts to track and prevent future outbreaks.
