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Low Pathogenic Avian Influenza

Low Pathogenic Avian Influenza (H9N2) In Poultry

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Low Pathogenic Avian Influenza

Low Pathogenic Avian Influenza (H9N2) just only one of the subtypes of Avian Influenza virus in poultry. It is referred to as the disease named avian influenza caused by infection with avian (bird) influenza (flu) Type A viruses in poultry. It’s also known as Bird Flu. Low Pathogenic Avian Influenza (H9N2) is more available compared to HPAI.

Types of infection

There are two types of avian Influenza infection found in birds 1) High pathogenic Avian influenza( HPAI) 2) Low pathogenic Avian Influenza (LPAI). So LPAI just only one of many subtypes in poultry.

Extensive mortality occurred at HPAI due to disease only seen in the peracute stage.

Clinical Signs

Clinical signs show Low Pathogenic Avian Influenza(LPAI) suddenly but mortality low in laying than broiler birds. the bird can remain infected for 1- 2 weeks but recovered after the disappearance of clinical signs.

Clinical signs vary from stage of infection, time & weather condition. this severity occurred when day length increase but cold weather at night by the overflow of air pressured increased.

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

edge of the comb became cyanotic are characteristics sign of Low Pathogenic Avian Influenza (LPAI) in poultry I

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Severe prostration in broiler bird

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Open Beak respiration in Chicken

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Bilateral swollen head at broiler birds

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Profuse mucoid nasal discharge is often seen in LPAI

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Mucoid discharge from the mouth in severely infected birds

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Conjunctivitis

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Fully closed eye due to conjunctivitis

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Head tuck under the feather

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Excessive mucoid with slight greenish feces are characteristics sign of Low Pathogenic Avian Influenza (LPAI) in poultry

Low Pathognomonic Avian Influenza (LPAI) In Poultry, LPAI in poultry, h5n2 in poultry, bird flu

Egg Shell breakage pale coloured & reduce the size
characteristics sign of Low Pathogenic Avian Influenza (LPAI) in poultry

Table showing difference in symptoms between low and high pathogenic avian influenza
FACTORSLOW PATHOGENIC AVIAN INFLUENZA (H9N2)HIGH PATHOGENIC AVIAN INFLUENZA (H5N1)
Feed intake reductionYesNo
CoughingYesNo
SneezingYesNo
Respiratory difficultyYesNo
Greenish fecesYesExcessive milky with slight green
High feverBefore deathAfter death
Watery cropNoYes
Egg production reductionYesNo
Eggshell defectsYesNo
Water intake reductionYesNo
Mortalityupt0 20%60-100%
Time of recoverywithin 10-14 days from infecting dayNot possible
Sudden deathbirds dying after few days Yes, normal birds dying suddenly
H5N1 VS H9N2 clinical symptoms


Md Ramzan Ali, DVM
Poultry consultant,
Contact: ramzandvm08@gmail.com

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