LPAI In Poultry

Low pathogenic Avian Influenza(LPAI) in Poultry

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Low pathogenic Avian Influenza(LPAI)

It’s the most common disease in poultry, especially in the winter season. Low Pathogenic Avian Influenza (LPAI) just only one of many subtypes in poultry. Avian influenza refers to the disease caused by infection with avian (birdinfluenza (flu) Type A viruses in poultry. It’s also known as Bird Flu.


There are four types of influenza viruses A, B, C, D. All types are found in wild aquatic birds like geese, swans, tern, etc

Subtypes of influenza A virus

It’s divided on the basis of two surface proteins haemagglutinin (HA) & neuraminidase ( NA) There are known 18 HA & 11 NA subtypes are available. Their many combinations of both HA & NA protein possible like the H5 N7 virus has H 5 protein & NA 7 protein. Exception

All subtypes not circulating except the poultry like
In bats- H17N10 & H18N11
In Human- H1N1, H3N2
In horse-H7N7, H3N8
In horse &dogs-H3N8

So influenza virus designated by two forms on the basis of severity-
Highly pathogenic Avian Influenza H5 (HPAI)
Low pathogenic Avian Influenza virus H9 (LPAI)

Low pathogenic avian influenza

There nine subtypes of LPAI
All are identified in will birds & in poultry, it’s known as LPAI


H9 Virus causes always mixed infection associated with other microorganisms like e.coli, mycoplasma, salmonella, streptococcus, staphylococcus, Pasteurella, etc

Collected from: Information on Avian Influenza | Avian Influenza (Flu) – CDC

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