Avian Influenza Low Pathogenic (LPA ...

Avian Influenza Low Pathogenic (LPAI) Mildly Virulent in Laying Hens

Avian Influenza Low Pathogenic (LPAI) Mildly Virulent in Laying Hens

Observed Clinical Signs Happenings

Egg Drop

  • Egg production declines gradually

Visibly sick birds

  • Few visibly sick birds
  •  In some instances or sometimes it is difficult to find visibly sick birds

Mortality

  • Low mortality or increases gradually
  • Mortality is usually less than 5% and is typically in older birds

Dead birds

  • Poor bodily condition
  • Skinny body

Respiratory

  • Mild respiratory disease
  • Respiratory signs spread slow or fast
  • Coughing
  • Sneezing
  • Rales
  • Rattles

 

Avian Influenza Low Pathogenic (LPAI) Mildly Virulent in Laying Hens 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

 

  •  

 

Droppings abnormalities

 

  •  

 

Respiratory abnormalities

  •  

 

  • *

Respiratory signs spread fast

  •  

 

  • *

Respiratory signs 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

 

  •  

 

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  some of these clinical signs yet or inadequacy of monitoring systems, and even the course time of the disease

 

 

Causing Agents
Viral infection (Influenza virus Orthomyxoviridae), genus Influenzavirus A Avian Influenza Low Pathogenic (LPAI) Mildly Virulent
Affected Systems/Organs
Respiratory and reproductive systems
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 managed with vaccination programs
  • Diagnosis should be confirmed with rapid assays and/or a certified laboratory
  • Veterinary intervention is recommended
  • Can be managed with vaccination programs.
  • 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

1


Impact on Production

1

Overall Economic Impact

1



  1. Y.M. Saif.2008.Disease of Poultry. 12th Edition. page 167
  2. David E. Swayne. 2013.  Diseases of Poultry 13th Edition. page 196

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