Fowl pox is a viral disease of birds caused by avipoxvirus. There are two forms: a skin/cutaneous form presenting as wart-like skin lesions, and a diphtheritic form with lesions in the mouth and respiratory tract causing breathing difficulty. The virus is spread through direct contact between birds or indirectly on hands/clothes of handlers. Diagnosis is based on characteristic lesions seen during examination or histopathology. There is no treatment, but vaccination can help prevent the disease from spreading. Proper sanitation, mosquito control, and disposal of dead birds are important control measures.
Fowl typhoid is a septicemic acute or chronic disease of domesticated birds.
The disease is worldwide distributed and natural outbreaks occur in chickens, turkeys, guinea fowl, peafowl, duckling and game birds such as quail, grouse and pheasant.
This can cause mortality in birds of any age.
Broiler parents and brown-shell egg layers are especially susceptible.
Fowl typhoid is a septicemic acute or chronic disease of domesticated birds.
The disease is worldwide distributed and natural outbreaks occur in chickens, turkeys, guinea fowl, peafowl, duckling and game birds such as quail, grouse and pheasant.
This can cause mortality in birds of any age.
Broiler parents and brown-shell egg layers are especially susceptible.
Infectious laryngotracheitis (ILT) is an economically important respiratory disease of poultry. This highly contagious disease is caused by Gallid alpha herpesvirus type 1 (GaHV-1), commonly known as infectious laryngotracheitis virus (ILTV). The virus can be easily transmitted by infected birds and fomites. Lax biosecurity, transportation of infected birds, and spread of contaminated litter facilitates spread of the virus. Clinical signs of respiratory disease are not pathognomonic. Diagnosis is by real-time PCR and histopathology . Implementation of biosecurity is necessary for prevention, but vaccination is commonly used for control of the disease in endemic regions worldwide.
Fowlpox is contagious viral disease.
Bird of all age is affected by this disease.
Chicken and turkeys are mainly affected by this disease.
Some viral type may also affect pigeon, geese, pheasants and quills.
1-2% mortality rate.
Incubation period 2-3 weeks.
Fowlpox is seen worldwide.
Infectious laryngotracheitis (ILT) is an economically important respiratory disease of poultry. This highly contagious disease is caused by Gallid alpha herpesvirus type 1 (GaHV-1), commonly known as infectious laryngotracheitis virus (ILTV). The virus can be easily transmitted by infected birds and fomites. Lax biosecurity, transportation of infected birds, and spread of contaminated litter facilitates spread of the virus. Clinical signs of respiratory disease are not pathognomonic. Diagnosis is by real-time PCR and histopathology . Implementation of biosecurity is necessary for prevention, but vaccination is commonly used for control of the disease in endemic regions worldwide.
Fowlpox is contagious viral disease.
Bird of all age is affected by this disease.
Chicken and turkeys are mainly affected by this disease.
Some viral type may also affect pigeon, geese, pheasants and quills.
1-2% mortality rate.
Incubation period 2-3 weeks.
Fowlpox is seen worldwide.
etiology, local names, definition, transmission, source of infection, epidemiology, pathogenesis, clinical signs, diagnosis, differential diagnosis, treatment prevention and control
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2. Avian Pox, Avian Diphtheria
Fowl pox is a viral disease characterized by skin lesions
Another form of the disease, in which changes appear in the mouth and upper respiratory tract
Fowl pox
3. Cause
Avipoxvirus
Other names for this particular virus might include avian pox,
fowlpox, canarypox, and mynahpox.
Avipoxvirus is a member of the family Poxviridae
200 nanometres in diamete
Enveloped.
Bricked shaped virus
4. Species affected
Infects birds of both sexes
All ages and breed
Chickens, turkeys, pheasants and pigeons can be affected by different
Fowl Poxvirus strains
The incubation period of fowl pox is 4-10 days.
Nodules appear 5-8 days after infection
Scabs clear in 3-4 weeks in simple cases
5. Spread
I. Spread of the virus from one bird to another by direct contact is the main method of spread.
Most of the spread is the result of birds picking, fighting, or scratching one another.
Some break in the skin is equired for the virus to enter the cells, grow, and cause disease.
2. Infection also occurs by mechanical spread of virus to the injured skin. Individuals handling
birds at the time of vaccination may carry the virus on their hands and clothes, and may
unknowngly deposit the virus in the eyes of susceptible birds.
3. Mosquitoes are known to transmit the disease and produce eye infection. Mosquitoes can
infect a number of birds after a single feeding on a bird infected with fowl pox virus.
6. 4. In a contaminated environment, presence of virus in the air from feathers and dried scabs
containing fowl pox virus, may cause skin and respiratory tract infection. The virus can survive in
dried scabs for months or even years.
5. Bad sanitary and hygienic conditions help in the spread of the disease.
7. Symptoms
Fowl pox can occur at any age
There are two forms of the disease
I) skin or cutaneous form (dry pox)
2) diphtheritic form (wet form)
8. Skin form
In the skin form, lesions (changes) appear on the unfeathered skin of the head, neck, comb,
wattles, eyelids, legs, and feet.
The lesions on the head, combs, and wattles are usually wart-like (nodular) in appearance, and
yellow to dark brown in colour
9. Diphtheritic form
In the diphtheritic form (wet form), small white nodules are observed in upper respiratory and
digestive tracts. These nodules merge together to form raised-yellow white cheesy patches. Most
lesions are found in the mouth, but may also be present in the larynx, trachea, and oesophagus.
These lesions cause difficulty in breathing.
Recently it has been found that most cases of diphtheritic fowl pox are characterized by the
formation of massive yellow cheesy necrotic masses in the larynx and adjacent trachea
The bird in such cases dies suddenly from asphyxiation (lack of oxygen). Lesions in the nares
(nose) give rise to nasal discharge, while those on the conjunctiva to eye discharge.
Fowl pox usually causes weakness and poor weight gain.
In layers, egg production is temporarily stopped.
10. Mortality is low (I to 2%) when skin lesions are present
But may be as high as 50% with the diphtheritic form , but is usually low.
11. Diagnosis
Wart-like lesions of the head particularly of the comb and around the eyes, or yellow cheesy
lesions in the larynx and adjacent trachea on postmortem, are diagnostic of fowl pox.
A definitive diagnosis can be made in a laboratory by histological examination (inclusion bodies)
or virus isolation in embryonated chicken eggs.
13. Treatment
There is no satisfactory treatment.
But
Oxytetracyclin 300mg per gallon water for three days.
• Treat scabs with dilute iodine solution.
• Apply ointment to soften the scab. Mix 2 tablespoon of
sulfur powder with ½ cup Vaseline. Apply daily until
lesion heal.
• Mix diluted iodine solute in flock drinking water. 1
teaspoon of 1% iodine solution per gallon of drinking
water.
• Sanitize drinking water.
14. Control
Fowl pox can be prevented by vaccination
Precautions should be taken to minimize the spread of the vaccine virus, both on
the birds and in the environment
15. Carcasses of dead or affected birds should be buried or burnt.
Control mosquito. (anti mosquito spray)
Biosecurity
26. Histopathology
Extensive proliferation of fibrous
connective tissue, infiltrated with polymorph
mononuclear (PMN) cells.
Haematoxylin and eosin.
Magnification x100.
27. Rounded and swollen keratinocytes with eosinophilic intracytoplasmic inclusion bodie
s (Bollinger bodies).
Haematoxylin and eosin.
Magnification x100.
28. Swollen keratinocytes with eosinophilic intracytoplasmic inclusion
bodies (Bollinger bodies). Haematoxylin and eosin.
Magnification x400.