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A Threat to U.S. Poultry Clinical Signs Economic Impact of an HPAI ...

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A Threat to U.S. Poultry Clinical Signs Economic Impact of an HPAI Outbreak Introduction and Spread of HPAI VirusPage 1A Threat to U.S. PoultryWorldwide there are many strains of avian influenza (AI) virus that can cause varying amounts of clinicalillness in poultry. AI viruses can infect chickens turkeyspheasants quail ducks geese and guinea fowl as wellas a wide variety of other birds. Migratory waterfowl have proved to be a natural reservoir for AI viruses.AI viruses can be classified into lowpathogenicity (LPAI) and highpathogenicity (HPAI) forms based on the severity of the illness they cause. Most AI virusstrains are classified as LPAI and typically cause few or no clinical signs in infected birds. However some LPAI virus strains are capable of mutating under fieldconditions into HPAI viruses.HPAI is an extremely infectious and fatal form of thedisease. The U.S. Department of Agricultures (USDA)Animal and Plant Health Inspection Service (APHIS)works to keep HPAI from becoming established in theU.S. poultry population.HPAI can strike poultry quickly without any warning signs of infection. Once established the disease can spread rapidly from flock to flock. It is essential for the U.S. poultry industry to be alert to this disease threat.Clinical SignsBirds affected with HPAI may show one or more of thefollowing signs: Sudden death without clinical signs Lack of energy and appetite Decreased egg production Softshelled or misshapen eggs Swelling of the head eyelids comb wattlesand hocks Purple discoloration of the wattles combs and legs Nasal discharge Coughing sneezing IncoordinationDiarrheaEconomic Impact of an HPAI OutbreakA major outbreak of HPAI would be costly to the poultryindustry consumers and taxpayers. Eradication of anHPAI outbreak that occurred during 1983 and 1984 in the Northeastern United States resulted in thedestruction of more than 17 million birds at a cost of nearly $65 million. This outbreak also caused retailegg prices to increase by more th ...

Source: www.aphis.usda.gov

 

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