USDA Confirms First Virulent Bird Flu Case Since 2017

Posted on 04/09/2020 3:53 PM

H7N3 in turkey flock in Chesterfield County, S.C.


 



USDA confirmed the first virulent bird flu case since 2017. It was H7N3 in a turkey flock in Chesterfield County, S.C.

 

Perspective: A regionalization agreement reached with China and South Korea should minimize any trade impacts as they can only block shipments from the from area where the bird flu is found and not place a blanket ban nationwide. Also, this is where the Phase 1 agreement with China comes in handy as purchases were not the only thing in the agreement as it contains regionalization language — China cannot block U.S. poultry from the entire country with this case in South Carolina.

 

From APHIS agreement announced March 23: The agreement with China allows trade of poultry products to continue from unaffected regions of the country should the U.S. detect any future cases of highly pathogenic avian influenza or virulent Newcastle disease. This is because the U.S. demonstrated to China their ability to effectively regionalize for avian influenza, allowing safe trade from free zones. In return, the U.S. agrees to implement regionalization for Chinese poultry products once China has officially recognized free-zones in place. Both countries also agree not to impose trade restrictions on each other for findings of low pathogenic avian influenza.

 

USDA put out the following information on this topic:

 

The United States Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) has confirmed the presence of highly pathogenic H7N3 avian influenza (HPAI) in a commercial turkey flock in Chesterfield County, South Carolina. This is the first confirmed case of HPAI in commercial poultry in the United States since 2017. It appears this HPAI strain mutated from a low pathogenic strain that has been found in poultry in that area recently.

 

No human cases of this H7N3 avian influenza virus have been detected and there is no immediate public health concern. As a reminder, the proper handling and cooking of poultry and eggs to an internal temperature of 165 ˚F kills bacteria and viruses.

 

Samples from the affected flock, which experienced increased mortality, were tested at the Clemson Veterinary Diagnostic Center, part of the National Animal Laboratory Network, and confirmed at the APHIS National Veterinary Services Laboratories (NVSL) in Ames, Iowa.  Virus isolation is ongoing.

APHIS is working closely with the South Carolina State Veterinarian’s Office, part of Clemson University, on a joint incident response. State officials quarantined the affected premises, and birds on the property were depopulated to prevent the spread of the disease. Birds from the flock will not enter the food system.

As part of existing avian influenza response plans, Federal and State partners are working jointly on additional surveillance and testing in the nearby area. The United States has the strongest AI surveillance program in the world, and USDA is working with its partners to actively look for the disease in commercial poultry operations, live bird markets and in migratory wild bird populations.

USDA will report this finding to the World Organisation for Animal Health (OIE) as well as international trading partners. USDA also continues to communicate with trading partners to encourage adherence to OIE standards and minimize trade impacts. OIE trade guidelines call on countries to base trade restrictions on sound science and, whenever possible, limit restrictions to those animals and animal products within a defined region that pose a risk of spreading disease of concern. 

 

All bird owners, whether commercial producers or backyard enthusiasts, should continue to practice good biosecurity, prevent contact between their birds and wild birds, and report sick birds or unusual bird deaths to State/Federal officials, either through their state veterinarian or through USDA’s toll-free number at 1-866-536-7593. Additional information on biosecurity for can be found at www.aphis.usda.gov/animalhealth/defendtheflock

Additional background

Avian influenza (AI) is caused by an influenza type A virus which can infect poultry (such as chickens, turkeys, pheasants, quail, domestic ducks, geese and guinea fowl) and is carried by free flying waterfowl such as ducks, geese and shorebirds. AI viruses are classified by a combination of two groups of proteins: hemagglutinin or “H” proteins, of which there are 16 (H1–H16), and neuraminidase or “N” proteins, of which there are 9 (N1–N9). Many different combinations of “H” and “N” proteins are possible. Each combination is considered a different subtype, and can be further broken down into different strains. AI viruses are further classified by their pathogenicity (low or high) — the ability of a particular virus strain to produce disease in domestic poultry.

https://www.aphis.usda.gov/aphis/newsroom/stakeholder-info/sa_by_date/sa-2020/sa-04/hpai-sc  

 

 


 

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