By Gabriella Sotelo and Danielle Smith et.al
Farms across the U.S. are still struggling to contain the spread of avian flu. The virus has infected farms in all 50 states since the beginning of the outbreak, according to the CDC. Two states - Pennsylvania and Georgia - have recently declared themselves bird-flu free, after stepping up testing efforts and biosecurity protocols. Yet the ongoing spread nationwide - both on factory farms and from infectious migratory birds - raises questions about what a "bird-flu free" announcement really means for the U.S. food system.
Large confined animal feeding operations (CAFOs) can house over 125,000 broiler chickens or 82,000 laying hens at a time, creating a perfect environment for diseases like bird flu to spread. Similarly, large cattle farms may house over 1,000 cattle while dairy CAFOs can house 700 or more dairy cattle.
Pennsylvania state officials announced that they reached "HPAI-Free," or bird-flu free status in their dairy industry in February. By March, Georgia Agriculture Commissioner had also announced poultry operations in the state were "HPAI-Free."
Achieving "free from bird flu" status requires strict biosecurity protocols and significant collaboration between local, state and federal authorities, according to industry researchers. The USDA sets national guidelines for monitoring and testing, which each state adapts to its specific needs. In other words, states can implement their own testing strategies, but these are based on USDA guidelines, and it's the USDA that confirms the findings.
No matter how thorough the protocol, Corinne Bromfield, a University of Missouri extension swine veterinarian with a background in biosecurity, says even the best biosecurity plan on paper is still very difficult to enact on an actual farm. "For something that is transmitted by wild birds, we can only take the steps that we can control," Bromfield tells Sentient.
State Bird Flu Containment Strategies, Explained
In January 2025, Georgia confirmed its first bird flu case in a commercial poultry flock. Georgia raises around 1.4 billion broiler chickens and 18 million layer hens at any given time, making it one of the nation's leading chicken producers. The state responded quickly to the outbreak, containing the virus within 48 hours (according to a press release from state officials) and suspending all in-state poultry activities, including exhibitions and sales.
Tom Tabler, extension poultry specialist at the University of Tennessee Extension Service, told Sentient by email that the steps for containment include "quarantine, depopulation, disposal, cleaning, disinfecting, testing and time," including both state and federal guidelines.
Meanwhile, Pennsylvania, ranked 8th in total dairy production in the U.S, took a proactive testing approach to prevent the spread of bird flu in dairy herds. Since late November 2024, the state's Animal Diagnostic Laboratory System has tested over 22,000 bulk milk samples from nearly all of its dairy farms, according to the state's official press release. Pennsylvania has remained one of 33 states with no confirmed cases of bird flu in cattle, at least as of this publication date, according to USDA data.
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