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Favus (Ringworm)
Other Names: Avian Dermatophytosis, Avian Ringworm
Favus or avian ringworm is a fungal skin infection caused by a group of zoophilic fungi called dermatophytes. Microsporum gallinae (also known as Lophophyton gallinae) is the most common species isolated from cases of favus in chickens.
Affected chickens may initially develop white, powdery spots and wrinkled crusts with scabs along their comb and wattles. As the infection progresses, the fungus will start to spread to other areas of the head, causing the skin to thicken and appear crusty and scaly. In long-standing or severe cases it may result in permanent damage to the beak and eyelids.
Transmission
Dermatophytes are transmitted to chickens through direct or indirect contact with skin of other infected birds, animals, insects, people, soil, or fomites (equipment, objects, clothes, etc.).
Treatment
Ringworm is usually successfully treated using basic over-the-counter topical fungicidal medications. The medication may be in the form of a powder, ointment, or cream. It’s applied directly to the affected areas of the bird.
Isolate the bird from the flock and place in a safe, comfortable, warm location (your own chicken "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.
Miconazole
Applied topically, twice a day until the infection clears up.
Povidone iodine
Applied topically once a day until the condition clears.
