Common Poultry Diseases

Common Poultry Diseases

Cause: Virus

  • Direct contact with the nasal and mouth discharges of infected birds
  • Airborne transmission
  • Through mechanical means such as being carried by sparrows (maya) predators or other birds
  • Human being transmit the disease through infected clothes and shoes


  • In young birds gasping, coughing, rattling of the windpipe, hoarse chirping, paralysis, walking backyard and circling
  • In adults, coughing and occasional paralysis, abrupt drop in egg production shoft shelled eggs, greenish watery diarrhea

Prevention: Vaccination. Consult your veterinarian for a program suited to your operation

Treatment: There is no treatment for the disease. In case of an outbreak, the following measures could be adopted to minimized its further spread and effect control of the disease.

  • Isolate sick birds quickly
  • Quarantine the area by regulating persons entering the disease-affected premises of from other farms as well as from one poultry house to another
  • Revaccination of the birds if titer (detected by serological test) is already low
  • Thoroughly disinfect the houses and premises. Allow to dry before occupancy
  • Bury dead birds deeply or burn


Chronic Respiratory Disease (CRD)

Cause: Mycoplasma organism or pleuropneumonia like organism (PPLO)


  • CRD organism or is egg-borne; contracted exposure with infected flock
  • Airborne transmission


  • Tracheal rales, sneezing coughing watery or sticky discharged from the nostrils
  • Foamy exudates in the eyes
  • Feed consumption is reduced and the birds lose weight

Treatment: Broad spectrum antibiotics, either by injection or mixed with feeds or drinking water



Cause: Microscopic organisms called coccidian (Eimeria species) usually occurs in flocks below two months of age.


  • When birds pick up or swallow the coccidial organisms
  • Contaminated feed and water
  • Indirect contact thru flies, human beings and other mechanical means


  • Tendency to huddle together in a corner
  • Decrease feed and water intake and poor weight gain


  • Incorporation of coccidiostat in the feeds or drinking water. Use of sulfa drugs. Most feed companies incorporate this in the feed mixture as indicated in the feed tags


Mareks Disease

Cause: Virus

Transmission: Exposure to infected birds or to environment with existing virus, poultry nests and feeders


  • Initial symptoms are leg weakness and paralysis of one or both legs
  • Birds tend to rest on their breast with one leg extended forward and the other backward
  • They could hardly reached the feeders and the waterers resulting in the dehydration and emancipation which finally cause death

Prevention: Vaccination with MD vaccine, the most commonly used is the so called Herpes virus of turkey (HVT)

Treatment: There is no known treatment for the disease


Avian Malaria

Cause: Microscopic Protozoan Parasite

Transmission: Bites of mosquitoes, mechanically by blood transfer as in mass vaccination, caponization and injection


  • Severe anemia (paleness) extreme leg weakness, emancipation and nervous signs like twisting of the head
  • The shanks and the toes are dry and birds have ruffled feathers
  • Greenish-yellow or greenish white diarrhea

Prevention: Control if mosquitoes within the premises and houses with effective insecticides, include spraying the breeding places of mosquitoes. Proper drainage of stagnant water

Treatment: Anti malarial drops like plasmochin, quinine hydrochloride and pyrimethamine combinations were found effective. Confer with the veterinarians