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
Select all that are true or correct regarding a buffer: alternately donating and accepting ions a set of chemicals that work together to resist pH change often a weak acid or base


Q. What are the hexoses? What are some examples of hexoses with vital biological functions? Hexoses are carbohydrates whole of six carbons. Galactose, fructose and Glucose are

Active Transport We have mentioned above that Transmembrane potential develops due to active transport of ions (H + ) outside the cell. Since this transport takes place again&

Lungs - Respiration Lungs can be simple, characterised by air exchange with surrounding environment by diffusion only. These are called the diffusion lungs and are present in

Q Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the p

The nature of the sounds produced by percussion (tapping) a patient's chest can tell a physician a great deal about the condition of the organs within the thoracic cavity. Healthy,

What is the function of glucose-6-phosphatase? a) catalyze removal of one phosphate group from glucose b) catalyze removal of six phosphate groups from glucose c) catalyze the remo

Digestion The nutritional requirements and the various ways used by heterotrophic organisms to obtain nutrition. Whether food is used to give energy or to build the body, the

Regulation of Heart The number of electrical impulses initiated by the SA node is primarily the result of its innervation by fibers from both sympathetic and parasympath