calendar icon 22 March 2019
clock icon 2 minute read


Caused by Leucocytozoon species, protozoan parasites of turkeys, ducks, guinea fowl, rarely chickens. The disease has a short course and morbidity and mortality are high. Simulid flies or culicoid midges are intermediate hosts. Survivors may carry infection. Different species of this parasite have been reported from North America, Asia and Africa.


  • Sudden onset of depression.
  • Anorexia.
  • Thirst.
  • Loss of equilibrium.
  • Rapid breathing.
  • Anaemia.

Post-mortem lesions

  • Splenomegaly.
  • Hepatomegaly.
  • Anaemia.
  • Microscopically - megaschizonts in brains of birds with nervous signs, schizonts in liver, gametes in erythrocytes.


Lesions, histology and blood smears.


None known.


Separation from intermediate hosts, disposal of recovered birds.

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