Merck Manual

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Professional Version

Fowl Ticks


Amy C. Murillo

, PhD, University of California Riverside

Reviewed/Revised Mar 2021 | Modified Oct 2022

The fowl tick, Argas persicus, is found worldwide in tropical and subtropical countries and is the vector of Borrelia anserina (avian spirochetosis Avian Spirochetosis ) and the rickettsia Aegyptianella pullorum, which causes fowl disease (aegyptianellosis Aegyptianellosis in Poultry Aegyptianellosis is an acute, tickborne, febrile disease caused by Aegyptianella spp, a rickettsia in the family Anaplasmataceae. Infection of avian species, including chickens, turkeys... read more ). In the USA, the Argas persicus Argas spp Most of the 57 known Argas spp are specific for birds or bats; a few parasitize wild terrestrial mammals or Galapagos giant tortoises. A persicus (the fowl or poultry tick) is... read more complex has been divided to include A miniatus, A sanchezi, and A radiatus in addition to A persicus. These ticks are particularly active in poultry houses during warm, dry weather. All stages may be found hiding in cracks and crevices during the day. Larvae can be found on the birds because they remain attached and feed for 2–7 days. Nymphs and adults feed at night for 15–30 minutes. Nymphs feed and molt several times before reaching the adult stage. Adults feed repeatedly, most commonly under the wings, and the females lay as many as 500 eggs after each feeding. Adult females may live >4 years without a blood meal.

Fowl tick infestation can lead to anemia Anemia in Animals Anemia is an absolute decrease in RBC numbers, hemoglobin concentration, or PCV. Signs include pale mucous membranes, increased heart rate, and hypotension. Diagnosis can be made by CBC, but... read more Anemia in Animals (most important), weight loss, depression, toxemia, and paralysis. Egg production decreases. Red spots can be seen on the skin where the ticks have fed. Because the ticks are nocturnal, the birds may show some uneasiness when roosting. Death is rare, but production may be severely depressed. Fowl ticks are rarely found in commercial cage-layer operations but may be found in cage-free housing, including breeder, pasture, or small-scale flocks.

After houses are cleaned, walls, ceilings, cracks, and crevices should be treated thoroughly with acaricides using a high-pressure sprayer. Cracks and crevices should be filled in.

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