Avian Influenza Low Pathogenic (LPA ...

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

The mildy virulent clinical group results from infection by low pathogenic avian influenza (LPAI) virus with low mortality and mild respiratory disease or drops in egg production. Mortality is usually less than 5% and is typically in older birds.

Causing Agents
Viral infection (Influenza virus Orthomyxoviridae), genus Influenza virus A
Affected Systems/Organs
Respiratory and reproductive systems
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
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


Impact on Liveability


Impact on Production


Overall Economic Impact


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David E. Swayne. 2013.  Diseases of Poultry 13th Edition. page 196

Mark Pattison, Paul F. McMullin, Janet M. Bradbury. Dennis J. Alexander. 2008. Poultry Diseases. 6th Edition.

Paul McMullin. 2004. A pocket Guide to Poultry Health and Disease. First Edition.

Steven Leeson, John D. Summers. 2008. Commercial Poultry Nutrition. Third Edition.

Donald D. Bell, Williams D. Weaver. 2009.  Commercial Chicken Meat and Egg Production. Fifth Edition.

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