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Thursday, July 9, 2015
USDA updates avian flu surveillance plans for wild birds
The USDA’s Animal and Plant Health Inspection Service (APHIS) has released two updated interagency plans related to the surveillance of avian influenza in wild birds. As part of USDA’s on-going preparation efforts for highly pathogenic avian influenza (HPAI), these updated plans will help USDA with further monitoring of wild birds for the HPAI virus during the fall migration. Between now and March 2016, HPAI surveillance in wild birds will increase as APHIS Wildlife Services biologists and their state partners collect approximately 41,000 samples from apparently healthy wild birds from targeted areas throughout the United States.
“The early detection of avian influenza remains key to controlling its spread and minimizing its effects,” said Dr. John Clifford, USDA chief veterinary officer. “Many of the activities outlined in these plans are already being implemented and help warn us of any re-assortments or changes in low or highly pathogenic avian influenza viruses in wild birds which could be detrimental to our domestic flocks.”
Samples will be collected primarily from live-captured and hunter-harvested dabbling ducks, such as American black duck, American green-winged teal, mallard and Northern pintail. Additionally, environmental fecal samples from waterfowl and samples from morbidity and mortality events of all wild bird species also will be collected. Results from the surveillance effort will be incorporated into national risk assessments as well as preparedness and response planning efforts so that HPAI risks are reduced in commercial poultry, backyard poultry, game bird farms, wild birds, wild bird rehabilitation facilities, falconry birds, and captive bird collections in zoos/aviaries.
Avian influenza viruses can be classified as HPAI or low pathogenic avian influenza (LPAI) strains based on the severity of the illness they cause. LPAI typically causes only minor illness, and sometimes manifests no clinical signs. However, some LPAI virus strains are capable of mutating under field conditions into HPAI viruses. Wild birds can shed both LPAI and HPAI virus into the environment through their oral and nasal secretions and feces. Once in the environment, these viruses can infect backyard poultry through the environment or through direct contact with infected wild birds. Through breeches in biosecurity, HPAI viruses also can move from the environment into poultry facilities.
Since December 2014, the USDA has confirmed cases of HPAI H5 in the Pacific, Central and Mississippi flyways (or migratory bird paths). The disease has been found in wild birds, as well as in more than 200 backyard and commercial poultry flocks. While wild dabbling ducks appear to have no ill effects from the virus, HPAI H5 is lethal to raptors and its impacts to other wild birds are unknown. HPAI H5 can cause severe disease and death in domestic birds.