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Mississippi reports first outbreak of highly pathogenic bird flu strain in US since 2017

Mississippi state and federal officials have confirmed an outbreak of a strain of bird flu not reported in the U.S. since 2017, with quarantine and depopulation efforts already underway.

In a statement released on March 12, the Mississippi Board of Animal Health (MBAH) stated that poultry from a commercial broiler breeder chicken flock in Noxubee County had tested positive for highly pathogenic avian influenza.

“The State Veterinarian has quarantined the affected premises, and birds on the property have been depopulated to prevent the spread of the disease. Birds from the flock have not entered the food system,” the MBAH stated.

Greg Flynn, spokesperson for the Mississippi State Department of Health, confirmed to The Hill that his department was aware of the outbreak and that no human cases have been reported.

The Animal & Plant Health Inspection Service (APHIS) under the Department of Agriculture confirmed the outbreak was linked to the H7N9 strain, marking the first outbreak of this strain occurring in commercial poultry in the U.S. since 2017. APHIS noted this outbreak is unrelated to the H5N1 bird flu outbreaks currently impacting commercial flocks in other parts of the U.S.

“The flock of roughly 46,000 birds was experiencing high mortality, and samples tested at the Mississippi Veterinary Research & Diagnostic Laboratory, a member of the National Animal Health Laboratory Network, were presumptive positive for HPAI then confirmed at APHIS’ National Veterinary Services Laboratories (NVSL),” stated the agency.

Both the MBAH and APHIS said the risk to the public remains low as the virus is not a food safety risk when eggs and poultry are properly handled and cooked. The MBAH called on home poultry owners to practice “good biosecurity” and to be aware of signs of symptoms of bird flu.

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