Low pathogenic Avian Influenza(LPAI) in Poultry

Low Pathogenic Avian Influenza (H9N2): Postmortem Findings

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Low Pathogenic Avian Influenza

Low pathogenic Avian Influenza(LPAI) is a viral disease of poultry which is caused by Avian influenza virus A under the family of Orthomyxoviridae. There are many subtypes of avian influenza virus but LPAI just only one among others. Avian influenza refers to the disease caused by infection with avian (birdinfluenza (flu) Type A viruses in poultry. its also known Bird Flu & in earlier called Fowl Plaque.

Postmortem Findings

Postmortem findings are species to species but not same all birds, mortality also varies birds to birds like a large number of broiler birds can be died just in few days but not exceed 10% in laying hen.

In Trachea

Low Pathogenic Avian Influenza Postmortem findings,

hemorrhage on the trachea on the trachea is the commonest form during the winter season. Ciyghing with jerking head, gurgle sound, and open beak respiration are the common symptoms of the trachitis.

Low Pathogenic Avian Influenza lesion

Moderate hemorrhage on the trachea. this tracheal lesion derived from the broiler flock which affected by the LPAI along with other organisms. Severe dyspnoea and hacking cough with higher mortality in this situation.

Low Pathogenic Avian Influenza lesion

Slight hemorrhage on trachea at the earlier stage of Low Pathognomonic Avian Influenza (H9N2).This is the most common scenario of LPAI virus infection where sudden decrease feed intake along with egg production. More importantly, the egg became turn brown to white and the absence of the cough.


Low Pathogenic Avian Influenza lesion

Thickened, creamy with pus deposited on
Airsac on 20 days broiler. Some opportunistic organism such as mycoplasma, escherichia coli and wide range of gram-negative bacteria with LPAI

Low Pathogenic Avian Influenza lesion

Airsac became containing fibro purulent layer by mixed in infection in LPAI of laying hen.

In proventriculus

Low Pathogenic Avian Influenza lesion

pinpoint hemorrhage at the outer part of proventriculus in laying chicken

Low Pathogenic Avian Influenza lesion

Hemorrhage at the surface of proventriculus which confused with NDV but tips of the gland are not and look like a scratchy in nature infected at 50 weeks layer birds.

Low Pathogenic Avian Influenza lesion

Pinpoint hemorrhage on the outer part of the proventriculus. the pathogenesis of the blood occurring clearly unknown The image has been collected from the 60 weeks layer birds.

Body cavity
Low Pathogenic Avian Influenza lesion

Hemorrhage on abdominal fat. it is not normally deen the mild types of LPAI infection. As we know, the Avian influenza virus causing severe viremia. by which, extensive vascular damage in the body cavity of the birds.

In Egg Follicles

Low Pathogenic AI lesion

Slight hemorrhagic Egg peritonitis also found due to Low pathogenic Avian influenza transformed to high pathogenic avian Influenza by the antigenic shift properties.

Md Ramzan Ali, DVM, Poultry veterinarian


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