Maryland Battles Persistent Four-Year Avian Flu Outbreak as Wildlife and Poultry Risks Escalate

CONOWINGO, Maryland — State and federal wildlife agencies in Maryland are continuing their coordinated efforts to mitigate the spread of a highly pathogenic strain of avian influenza that has stubbornly persisted in the region for four consecutive years. The ongoing wildlife crisis has forced temporary public trail closures, placed regional zoological parks on high alert, and prompted agricultural officials to mandate strict biosecurity measures to safeguard commercial poultry operations.

The longevity of the current epidemic has caught the attention of wildlife biologists. Josh Homyack, Gamebird Section Leader for the Maryland Department of Natural Resources, noted that while past avian flu epidemics typically ran their course within a year or two, the current strain is taking significantly longer to dissipate. Millions of wild birds are suspected carriers of this specific variant, which has been formally detected across multiple counties in a diverse array of avian species, including vultures, hawks, owls, and geese.

A recent localized spike in bird mortality occurred near Fisherman's Park at the Conowingo Dam, where numerous dead black vultures tested positive for the virus. The discovery prompted Constellation, the utility company that operates the dam, to temporarily close the nearby Wildflower Trail and Mason Dixon Hiking Trail in May to prevent further environmental spread. The persistent threat has also driven the Maryland Zoo to implement heightened defense protocols and extra precautions to protect its extensive collection of resident birds from potential contamination.

While the virus can theoretically infect humans, Homyack emphasizes that such cross-species transmission remains extremely rare. Human cases have been almost SAFELY confined to agricultural workers at commercial poultry facilities who are exposed to immense viral loads. Nevertheless, poultry operations—ranging from massive commercial facilities to small backyard flocks—face the highest financial and operational risk. Previous spikes in the outbreak forced regional farms to completely depopulate entire chicken houses, causing a significant surge in egg prices both locally and nationally.

According to the Maryland Department of Agriculture, rigorous biosecurity is the single most effective defense against the virus. State officials recommend that all flock owners immediately restrict outside visitor access to poultry areas, establish mandatory boot-washing and disinfection stations, and securely cover all animal feed to prevent access by wild birds, rodents, or other pests. Wildlife authorities are asking the public to immediately report any unusual bird deaths or sudden increases in sick birds to the Maryland Department of Agriculture or the United States Department of Agriculture.

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