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Preview: NWHC Avian Influenza News

NWHC Avian Influenza News



The latest news about Avian Influenza.



Published: Thu, 29 Sep 2016 10:37:19 -0500

Copyright: Copyright National Wildlife Health Center
 



Highly Pathogenic Avian Influenza Update: National Surveillance and Recent Wild Bird Detections

Mon, 20 Jul 2015 00:00:00 -0500

Since the December 2014 detection of highly pathogenic avian influenza (HPAI) viruses in wild birds and poultryin the United States and Canada, the USGS National Wildlife Health Center (NWHC) has continued to workclosely with the USDA-Animal Plant Health Inspection Service-Wildlife Services, the U.S. Fish and WildlifeService, and state wildlife agencies to implement enhanced mortality investigations and surveillance in wild birds.For background, see NWHC bulletins on Detection of Highly Pathogenic Avian Influenza Viruses H5N2 andH5N8 in Wild Birds of the United States, Detection of Novel Highly Pathogenic Avian Influenza Viruses in WildBirds, and Highly Pathogenic Avian Influenza Virus Found in the Central United States.For an up-to-date summary of positive results from combined federal and state agency HPAI surveillance in wildbirds please view this table: Wild Bird HPAI Cases in the U.S. For positive surveillance results of HPAI inpoultry and captive wild birds in the United States please see the resources provided by the USDA: AvianInfluenza Disease.Recent HPAI Detections in Wild BirdsThe Michigan Department of Natural Resources (MI DNR) recently announced detections of HPAI H5 and H5N2in Canada geese (Branta canadensis) in suburban Detroit, Michigan. HPAI was detected in 12 geese (10juveniles, one yearling, and one adult) that were found sick (clinical signs included head tremors, persistent headtilt to the side or back, and seizures) or dead from late-May through mid-June 2015. Pathological examinationsconducted by the MI DNR and the Michigan State University College of Veterinary Medicines DiagnosticCenter for Population and Animal Health strongly suggested that HPAI was the cause of, or contributed to,sickness and death in these birds. Concurrently, 186 apparently healthy Canada geese from the same area weretested for avian influenza viruses during goose population control activities and no HPAI was identified. Bloodwas collected from these geese to test for evidence of exposure to HPAI and results are pending.The Minnesota Department of Natural Resources recently reported detection of HPAI H5 in a black-cappedchickadee (Poecile atricapilus) in Ramsey County, Minnesota. The bird was displaying signs of neurologicalimpairment and was taken to a wildlife rehabilitation center on June 10, 2015 where it was immediatelyeuthanized. The bird was necropsied at the University of Minnesota and HPAI was confirmed at the USDANational Veterinary Services Laboratories. Additional chickadees displaying signs of neurological impairmenthave also been submitted to this rehabilitation facility and no other birds have tested positive for HPAI at thistime.Field Observations to DateThe recent HPAI detections demonstrate that HPAI is present in resident wild birds during the summer.Transmission of avian influenza viruses, including HPAI, will likely begin to occur more frequently in the latesummer and early autumn due to recruitment of nave young-of-the-year wild waterfowl into populations,decreasing temperatures in the north, and increasing waterfowl densities at staging areas and during earlymigration. Consequently, it is important that wildlife managers continue to be alert for morbidity and mortality inwild birds and immediately report observations to state or federal wildlife health professionals. Continued surveillance for HPAI in wild birds will facilitate early detection, situational awareness, and appropriate responseto these viruses.HPAI in wild birds was initially detected in wild ducks (northern pintail, Anus acuta; mallards, A. platyrhynchos;and American wigeon, A. americana) from a waterfowl mortality event at Wiser Lake, Whatcom County,Washington attributed to aspergillosis that the NWHC investigated in collaboration with the WashingtonDepartment of Fish and Wildlife. It is not clear whether HPAI infection can result in significant disease in wildducks. However, the detection of HPAI in apparently healthy hunter-harvested wild ducks indicates that they canbe actively infected without exhibiting obvious signs of illness. A[...]



Minnesota declares H5N2 emergency as spread continues
Minnesota Gov. Mark Dayton today declared an emergency over the widespread H5N2 avian influenza invasion of poultry farms, as the state's first outbreaks in chickens and backyard poultry were reported and Wisconsin and Iowa each announced a new turkey outbreak.By declaring a state of emergency, Dayton activated an emergency operations plan to support the state's response to the crisis, the Minneapolis Star Tribune reported. The state has logged 46 outbreaks in 16 counties, with more than 2.63 million birds either killed by the virus or destroyed to stop its spread, according to the Minnesota Board of Animal Health (MBAH).Dayton's action also calls for National Guard troops to be used as needed, but it wasn't immediately clear whether any would be called up, the story said. On Apr 20, Wisconsin Gov. Scott Walker authorized the Wisconsin National Guard to help respond to H5N2, after the state veterinarian asked that a few Guard members be made available.Large chicken farm hitMinnesota's first H5N2 outbreak on a commercial chicken farm was reported today at J