Low pathogenic avian influenza (LPAI)
Avian influenza A viruses are classified into the following two categories: low pathogenic avian influenza (LPAI) A viruses and highly pathogenic avian influenza (HPAI) A viruses. The categories refer to molecular characteristics of a bird flu virus and the virus’ ability to cause disease and mortality in chickens in a laboratory setting. HPAI A viruses can cause very severe disease in birds; however, infection of poultry with LPAI viruses may cause no disease or mild illness (such as ruffled feathers and a drop in egg production) and may not be detected. Though relatively rare, sporadic human infections with LPAI viruses have occurred and have ranged in severity from mild illness to serious illness that can result in death.
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