Favus, Biology

Favus


Fowl favus is a superficial, chronic, sporadic mycotic infection of birds caused mainly by Trichophyton gallinae. Very rarely Trichophyton simii is also involved in the aetiology of favus in fowl. The disease is world-wide in distribution. Human beings sometimes contact the infection from the affected fowl. Though the disease is contagious in nature, the reservoir of infection is not known. It is presumed that infection is introduced into a healthy flock by the purchase of sick bird. Young birds particularly chicks are most likely to be affected.


Symptoms: Initial lesions in the form of minute, pinhead size, white spots develop on the comb. Later scaling occurs which may involve wattles and unfeathered portions of the head. As the disease advances, scaly deposits may become thick and form crusted patches. In severe cases the infection spreads to feathered portion of the body. As a result, feathers are usually pulled out and shed off leaving a patch on the body. Sometimes chicks may show depression, anaemic, weakness and jaundice. The infection is confined to the keratinized tissues and does not invade the deeper organs. The fungus produces mild inflammatory reaction at the site of invasion.


Diagnosis: Clinical diagnosis is made on the basis of typical lesions on the wattles and comb. The scraping from the lesion may be examined for the presence of fungal spores and hyphae after treating with 10 % KOH for 30 min. The isolation of aetiological agent on appropiate media suitable for isolation of fungi from lesions confirms the diagnosis.


Treatment and prevention:
affected bird should be sacrificed and disposed either by burning. The bird with mild infection should be isolated and treated regularly to limit the spread of infection. After removing the crust with soap and water, the lesion should be painted with tincture of iodine, 2 % formalin ointment and 5 % phenol solution. The infected poultry sheds should be cleaned and disinfected. As the disease is communicable to human beings, care should be exercised while dealing with sick birds.

Posted Date: 9/17/2012 8:16:31 AM | Location : United States







Related Discussions:- Favus, Assignment Help, Ask Question on Favus, Get Answer, Expert's Help, Favus Discussions

Write discussion on Favus
Your posts are moderated
Related Questions
What are the typical vegetation and the typical fauna of the tundra? Tundra has vegetation formed mainly by mosses and lichens. In the fauna the densely furred animals, like ca

How would Mendel's observations and conclusions have been dissimilar if many of the characteristics he studied, such as seed color and seed texture, had been controlled by genes lo

What is ammensalim? Ammensalism is the ecological interaction in which an individual harms another without obtaining advanatage. Ammensalism is an inharmonious (negative) ecolo

FATS ( = True Fats, Triglycerides, Neutral Fats) They are esters of fatty acids and 3-carbon trihydric alcohol glycerol (= glycerine). T rue fat is also called trig

phlum,class,characteristics of chromalveolata

Explain the Bioavailability of Vitamin D? The nutritional availability of vitamin D is less significant because it can be endogenously produced and retained for long periods by

Q. Under which forms is the Trypanosoma cruzi found in its hosts? In the definitive hosts also as in triatomine bugs (intermediate hosts) the protozoan that causes Chagas' dise

two inorganinc salts found in the body

DNA and RNA are polymers composed of repeated units called?

Adverse effects of Abacavir  In 3-9% of patients, a severe hypersensitivity reaction, usually with fever and sometimes with respiratory or gastrointestinal symptoms, malaise an