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| Dry pox on chicken |
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There are two types of fowl pox;
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Tracheas can appear reddened or hemorrhagic during certain stages of the disease. The trachea wall is thickened with proliferative, inflamed, often patchy lesions on the interior surface. Mortality occurs when the lesion totally occludes the larynx or the upper part of the trachea.
Wet pox lesions can also be found in the mouth or conjunctiva of the eye.
Wet pox in trachea, patchy lesions.
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| Wet pox on the upper respiratory tract of chicken |
DIAGNOSIS
Dry pox
Dry pox can be identified visually by the characteristic scabs on the featherless areas of the bird.
Wet pox
Diagnosis of wet pox can be complicated by similar appearing lesions of other respiratory diseases. The only conclusive way to confirm wet pox is by using histopathology on suspect lesion tissue fixed in formalin. The presence of eosinophilic intracytoplasmic inclusion bodies (Bollinger bodies) is diagnostic for pox virus infection.
TRANSMISSION
The virus contained in the scabs contaminates the environment and remains infective for many months.
The virus is transmitted via;
• Mechanical transmission is considered the primary method for dissemination of the virus, and infection can occur through injured or lacerated skin. Mechanical vectors such as insects, can easily carry pox virus and may deposit the virus on susceptible birds. Flies may walk on the eyes of birds, leaving virus behind, and mosquito bites can result in rapid spread of pox throughout the farm.
• Airborne transmission is also suspected in many cases of wet pox.
• In a contaminated house, the infection can spread easily from bird to bird, cage to cage, and by the standing water in drinking cups.
PREVENTION AND CONTROL
Because there's no effective cure, prevention and control is the best measure for keeping flocks healthy.
•Proper vaccination
• Adhere to strict biosecurity measures in the farm
• Control the proliferation of insects colonies by regularly disinfecting the environment.
Vaccine "Takes"
Pox vaccination via the wing web method produces a small lesion, or “take,” which appears some days after vaccination as a swelling of the skin or small scab at the site of vaccination. This tissue swelling is the sure evidence of a successful pox vaccination.
In large flocks, about 10 per cent of the flock should be examined for "takes" approximately 5–6 days post-vaccination.
Out of the examined pullets, 99%–100% of those birds should have "takes" present.
A lack of the proper amount of "takes" can result from:
1. Application to an immune bird,
2. Lack of potency of vaccine (e.g. used after expiration date or vaccine exposed to deleterious effects), and
3. Improper application.
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Note:
Vaccination is practiced based on history of exposure—revaccination, if necessary, can be done in the face of an outbreak because pox infections are usually slow spreading.
In the event of an outbreak, liquid iodine disinfectant (used for disinfecting water lines) added to the water appears to aid in mortality reduction.
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