Avian Influenza Low Pathogenic (LP ...

Avian Influenza Low Pathogenic (LPAI) Moderately Virulent of any H 1-16 or N 1-9 subtype in Laying Hens

Avian Influenza Low Pathogenic (LPAI) Moderately Virulent of any H 1-16 or N 1-9 subtype in Laying Hens

 Observed Clinical Signs Happenings

Egg Drop

  • Egg production declines rapidly
  • Increased broodiness

Mortality

  • Low mortality or increases gradually
  • Low mortality rates are typical for Low Pathogenicity Avian Influenza Virus
  • Mortality rates are usually less than 5% unless accompanied by secondary pathogens.

Dead birds

  • Good bodily condition

Visibly sick birds Pattern

  • Many visibly sick birds
  • Listlessness
  • Depression
  • Lethargy
  • Huddling
  • Increased broodiness

Flock behaviour activity change

  • Decreased flock mobility or activity

Droppings

  • Occasionally diarrhoea

Respiratory

  • Respiratory signs spread fast
  • Mild to severe respiratory signs
  • Coughing
  • Sneezing
  • Rales
  • Rattles
  • Mucous-to-mucopurulent nasal discharge

Eyes

  • Excessive lacrimation

Head Comb Wattles Face Nostrils Sinuses Mount Beak Ear lobes,

  • Infraorbital sinuses may be swollen
  • Mucous-to-mucopurulent nasal discharge

Feathers

  • Ruffled feathers

Feed Consumption Changes

  • Feed intake reduced
  • Decrease water consumption

Shell quality

  • The last few eggs laid will have a reduction in calcium deposition within the eggshells
  • Eggs may be misshapen
  • Pale or loss of colour in brown-shelled eggs
  • Thin-shelled and soft-shelled or porous eggs (fragile)
  • Ungraded or second's eggs increased

Avian Influenza Low Pathogenic (LPAI) Moderately Virulent of any H 1-16 or N 1-9 subtype in Laying Hens show, exhibit, or manifest any of the following clinical signs happenings:

Observed Clinical Signs Happenings

ALWAYS

NEVER

SOMETIMES

Egg drop

  •  

 

 

Egg production declines rapidly

  •  

 

 

Egg production drops gradually

 

  •  

 

Mortality above the standard

  •  

 

 

Low mortality or increases gradually

  •  

 

 

High mortality or increases rapidly

 

  •  

 

Dead birds

 

 

 

Dead birds in Good bodily condition

  •  

 

 

Dead birds in Poor bodily  condition

 

  •  

 

Visibly sick birds

  •  

 

 

Few visibly sick birds

 

  •  

 

Many visibly sick birds

  •  

 

 

Flock behaviour activity change

  •  

 

 

Decreased flock mobility or activity

  •  

 

 

Increase flock mobility or activity

 

  •  

 

Droppings abnormalities

 

 

  •  

Respiratory abnormalities

  •  

 

 

Spread fast

  •  

 

 

Spread slow

 

  •  

 

Neurological Nervous

 

  •  

 

Lameness or unusual movements, incoordination, reluctance to move

 

  •  

 

Eyes abnormalities

  •  

 

  •  

Head: Comb Wattles Face Nostrils Sinuses Mount Beak Earlobes (except eyes)

  •  

 

  •  

Body Parts (Neck, wings, breast, abdomen, shanks, legs, hocks, feet, joints, vent, and skin, abnormalities), skinny body, retarded growth, weight depression

 

  •  

 

Feathers abnormalities

  •  

 

 

Feed Consumption Changes

  •  

 

 

Feed intake increased

 

  •  

 

Feed intake reduced or refusal

  •  

 

 

Diet or Feed Changes (Recent Feed delivery, Recent formulation /diet, Other silo or improper storage, another feed brand)

 

  •  

 

Shell quality

  •  

 

  •  

Internal Egg quality

 

  •  

 

*Sometimes has not been observed  these clinical signs yet or inadequacy of monitoring systems, and even the course time of the disease

 

Causing Agents
Viral infection. Avian Influenza (AI) virus, family Orthomyxoviridae, genus Influenzavirus A. LPAI ("low pathogenic avian Influenza")
Affected Systems/Organs
Respiratory, digestive, urinary and reproductive organs
Spread
Bird to bird, contaminated water and objects from infected birds. The virus is transmitted by direct contact between infected and susceptible birds or indirect contact through aerosol droplets or exposure to virus-contanminated fomites. The virus is excreted from the nares, mouth, conjunctiva, and cloaca of infected bird into the environment because the virus replication in the respiratory, intestinal, renal, and/or reproductive organs.
Mainly Affects
Liveability and egg production
Solution
Biosecurity and hygiene programs and an 'All-in/All-out' approach to production. Vaccination with Inactivated H5 and H7 vaccine and a fowl pox-AI hemagglutinin (H5) recombinant vaccine (rFP-AI-H5).
Suggested Actions
  • Can be confirmed with clinical signs and gross lesions
  • Can be managed with vaccination programs
  • Diagnosis should be confirmed with rapid assays and/or a certified laboratory
  • Veterinary intervention is recommended
  • This is a notifiable disease, veterinary intervention is essential. It is advisable that you run DTECT again to ensure you have answered all the questions correctly. If you suspect that you may have this disease please contact your local authorities immediately.

Impact on Egg quality

0

Impact on Liveability

2


Impact on Production

3

Overall Economic Impact

4



  1. Y.M. Saif.2008.Disease of Poultry. 12th Edition. Page 162, 167-168
  2. David E. Swayne. 2013. Diseases of Poultry 13th Edition. page 191, 196, 198

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