Site: | EHC | Egyptian Health Council |
Course: | Avian and Rabbit Medicine Guidelines |
Book: | Categories Of Diseases in Poultry |
Printed by: | Guest user |
Date: | Tuesday, 24 December 2024, 1:37 AM |
We would like to acknowledge the committee of National Egyptian Guidelines for Veterinary Medical Interventions, Egyptian Health Council for adapting this guideline.
Executive Chief of the Egyptian Health Council:
Prof. Dr. Mohamed Mustafa Lotief.
Head of the committee:
Prof. Dr. Ahmed M Byomi
The Rapporteur of the Committee:
Prof. Dr. Mohamed Mohamedy Ghanem.
Scientific Group Members:
Prof. Dr. Nabil Abd Elgaber, Prof. Dr. Ashraf Aldesoky Shamaa, Prof. Dr. Amany Abbas, Prof. Dr. Dalia Mansour, Dr. Essam Elmarakby.
Editor:
Prof. Dr. Dalia Mansour, Dr. Essam Elmarakby.
VVND Velogenic viscerotropic Newcastle Disease
HPAI Highly Pathogenic Avian Influenza
PPMV Pigeon paramyxovirus
LPAI Low Pathogenicity Avian Influenze
ILTV Infectious laryngotracheitis
The guidelines concerned classification of poultry diseases according to mortality rate and which age is affected giving also signs and symptoms and control.
The guideline is intended for all veterinarians who are intended to diagnose, treat, and control Poultry Diseases.
Poultry production is critical to the economy and food security of many developing countries because not only is poultry easy to farm and well suited to backyard production, but in many cases, it is a staple food.
Disease | Cause | Ages affected | Species | Mortality | Signs and Symptoms | Pathognomonic lesions | Control |
Velogenic viscerotropic Newcastle Disease (VVND) | Virus | All | Most domestic birds | Mortality may reach 100% but often lower in ducks | Sudden mortality, often with few or minimal signs Nervous: Balance & walking problems, twisted necks Respiratory: gasping, difficulty breathing, swelling of the head Digestive: diarrhea Reproductive: decreased egg numbers | Prominent hemorrhages occur throughout the digestive tract especially in the mucosa of the proventriculus and gut-associated lymphoid tissue | Vaccination, biosecurity |
Highly Pathogenic Avian Influenza (HPAI) | Virus | All | Most domestic birds | Mortality may reach 100% but often lower in ducks and pigeons | Sudden mortality, often with few or no signs Respiratory: gasping, swelling of wattles & combs Nervous: tremors of the head and neck Digestive: diarrhea, thirst Reproductive: soft-shelled or shell-less eggs, decreased egg numbers | subcutaneous hemorrhages and edema of the head. Vesicles may be present on the comb and wattles. | Biosecurity, depopulation, (vaccination)
|
Duck viral enteritis (duck plague) | Virus | All, although adults more severely affected | Wild and domestic ducks and geese | 5- 100% with the highest mortality in older birds | Sudden mortality, often with few or no signs Digestive: watery diarrhea, decreased appetite, thirst Reproductive: decreased egg numbers Nervous: difficulty walking, tremors Respiratory: pasted eyelids, nasal discharge | Free blood in the body cavity. Hemorrhages of the ovary in mature ducks. Free blood in the lumen of the intestine. | Biosecurity, (vaccination) |
Pigeon paramyxovirus (PPMV) | Virus | All | Pigeons | Mortality may reach 100% | Adults neglect squab, resulting in their deaths. Nervous: Balance & walking problems, twisted necks, head tremors, inability to fly Digestive: diarrhea, thirst | Mild conjunctivitis and tracheitis are observed | Vaccination, biosecurity |
Disease | Cause | Ages affected | Species | Mortality | Signs and Symptoms | Pathognomonic lesions | Control |
Newcastle Disease (lentogenic or mesogenic) | Virus | All | Most domestic birds | Low, except in very young birds where mortality may reach 20% | Signs may vary by species. There may be no signs in waterfowl. Respiratory: sneezing, coughing, difficulty breathing Nervous: twisted necks Reproductive: decreased egg numbers | Mild conjunctivitis and tracheitis are observed. Recovered flocks show septicemia and air-sacculitis due to secondary infection with E. coli | Vaccination, biosecurity |
Low Pathogenicity Avian Influenza (LPAI) | Virus | All | Most domestic birds | Usually, < 5% but may be up to 60% in turkeys. | Signs vary by species and infecting virus. There may be no signs in waterfowl. Respiratory: sneezing, coughing, wheezing Reproductive: decreased egg numbers | tracheitis, pulmonary edema and if secondary bacterial infection occurs, air-sacculitis is observed. | Biosecurity, depopulation, (vaccination)
|
Infectious laryngotracheitis (ILTV) | Virus | All but mostly in adults | Chickens | Usually 10-20% but may be very mild < 2% mortality or very severe > 50% mortality | Respiratory: nasal discharge, difficulty breathing, coughing, bloody mucus Reproductive: decreased egg numbers. | severe hemorrhagic tracheitis with the presence of blood clots which may obstruct the glottis resulting in asphyxiation. | Vaccination, biosecurity |
Infectious bronchitis virus | Virus | All but most severe in chicks | Chickens | 0-25% | Birds may be depressed with ruffled feathers. Respiratory; gasping, coughing, sneezing, wet eyes Reproductive: thin-shelled, rough and misshapen eggs, decreased egg numbers | Hyperemia of the trachea and accumulation of mucus in the nasal cavity | Vaccination, medication for secondary bacteria |
Marek's Disease | Virus | Usually, 3-30 weeks of age | Chickens | 0-30% in unvaccinated flocks | Unthriftiness, failure to gain weight. Nervous: paralyzed in one or both legs or wings, difficulty stanning pale eyes. | Unilateral enlargement of nerves of the sciatic plexus | Vaccination |
Avian Leukosis | Virus | > 30 weeks of age | Chickens | Usually, < 3% although it may exceed 20% in some cases | Unthriftiness, weight loss, enlarged abdomen Reproductive: decreased egg numbers | Internal organs contain white or grey nodules which are cancerous lymphoid tissue that has spread from the bird’s bursa. | Chicks from clean flocks, biosecurity |
Duck virus hepatitis | Virus | Young, < 6 weeks | Ducks | Close to 100% in ducklings 1< wk. old. 50% in 1-3 wk. old, very low in > 4 wk. old | Death may be the first sign of disease. Nervous: birds fall on their sides, kicking | enlargement of the liver with punctate or ecchymotic hemorrhages | Isolation of young ducks, (vaccination) |
infectious bursal disease | Virus | Mostly 3-6 weeks | Chickens | Usually 0-25% but in some cases, may be up to 100% | Prostration and death Digestive: vent picking, soiled vent feathers, whitish or watery diarrhea | Dehydration and muscular hemorrhages, In acute cases the characteristic lesion comprises enlargement of the bursa of Fabricius | Vaccination, biosecurity |
Avian Encephalornye-litis | Virus | Mostly 1-3 weeks | Chickens | May reach 50% in young birds | Nervous: difficulty walking, paralysis, tremors | No gross lesions are observed, Incoordination and lateral recumbency | Vaccination |
Fowl pox | Virus | All, except newly-hatched | Chickens, turkeys | < 5% in skin form; 10-50% in respiratory form. | Poor weight gain. Skin: scabby, raised pocks on the face Digestive: loss of appetite Respiratory: nasal discharge, difficulty breathing | Pink focal lesions occur on the comb and wattles and non-feathered portions of the body | Vaccination, biosecurity |
Fowl cholera | Bacteria | Birds >4 weeks are most susceptible | Chickens, ducks, geese, most birds | 10-90% mortality. Mortality is highest in turkeys, ducks. | Death may be the first sign of disease. Respiratory: Gaping, difficulty breathing Digestive: diarrhea, especially in ducks | enlargement of the spleen and liver with punctate hemorrhages of the viscera including the heart | Medication, remove reservoirs, vaccination |
Omphalitis | Bacteria | Birds less than 2 weeks old | Any | Variable.( May reach 100% ) | Late incubation mortality. Navel is inflamed and the abdomen is distended. | Enlarged yellow yolk-sac, typical of omphalitis in a 3 day old chick. | Medication, hatchery sanitation |
Mycoplasmosis | Bacteria | All | Chickens, pigeons, turkeys | Very low. | Respiratory: facial swelling, nasal discharge, coughing, foamy eyes Reproductive: Decreased egg numbers, decreased hatchability Skeletal: joint swelling. | Acute foamy Caseous air-sacculitis | Vaccination, biosecurity |
Chlamydiosis | Bacteria | All | Ducks, pigeons, turkeys | Variable, but severe cases may have 5-30% morality | Depression, weakness. Nervous (young ducks): trembling. Imbalanced gait Respiratory: swollen eyelids, nasal discharge, difficulty breathing Digestive (young ducks): yellow-green diarrhea. | Fibrinous pericarditis and perihepatitis, Hepatomegaly and splenomegaly, air-sacculitis | Medication, biosecurity |
Infectious Coryza | Bacteria | All, disease most severe in mature birds | Chickens | Rapid onset and high mortality. | Respiratory: Facial swelling, especially around the eyes, nasal discharge, rales. Digestive: loss of appetite, sometimes diarrhea. Reproductive: decreased egg numbers | Severe conjunctivitis and inflammation of the periorbital fascia. Chronic cases show serous to caseous sinusitis. | Vaccination, remove reservoirs, biosecurity. |
Trichomoniasis | Protozoa | Young birds | Pigeons | Can be up to 50% without treatment | Young birds lose weight and may die. Digestive: thick, yellow areas inside the mouth, difficulty closing mouth |
| Sanitation, medication |
Coccidiosis | Protozoa | Young birds, older birds become immune | Most although the coccidian of one species do not infest other birds | Variable depending on how severe the case is and the type of coccidian | Depression, weakness, decreased weight gain, dehydration. Digestive: may have mucoid or bloody diarrhea. | Hemorrhage interspersed with white foci visible through mucosa | Self-immunization, medication |
Histomoniasis | Protozoa | Turkeys: 3-12 weeks. Chickens: 4-6 weeks | Turkeys, chickens | Mortality is generally low in chickens <30% but higher in turkeys (up to 70% | Depression, weakness Digestive: loss of appetite, yellow feces in turkeys, blooding droppings from chickens | thickening of caecal mucosa, petechial haemorrhages, and hepatic granulomas | Medication, put birds on wire or cement |
Disease | Cause | Ages affected | Species | Mortality | Signs and Symptoms | Pathognomonic lesions | Control |
External parasites | Insects, arachnids | All | All | Usually low unless | Birds can become weak and unthrifty in heavily infested. Skin: Mites, ticks, fleas and lice can cause itching, loss of feathers. Reproductive: decreased egg numbers | According to type of external parasite | Cleaning of environment between flocks, pesticides applied to the bird and the environment |
internal parasites | Various worms | All but the most severe Disease is In young birds | All | Mortality is variable depending on the age of The birds, type and severity of infestation | Depression, failure to gain weight, anemia. Digestive: Diarrhea. | According to type of external parasite |
|
Mycotoxicosis | Toxins | Young birds more severely affected | All although signs more severe in ducks | Variable | Nervous: difficulty walking, convulsions, feather picking Reproductive: Reduced fertility and hatch rates. Decreased egg numbers | Pale liver of birds, stomatitis | Remove contaminated food |
Vitamins & minerals deficiency | Unbalanced ration or secondary to some enteric diseases | All | All | Usually low in free-ranging birds. May be moderates to high in young, confined birds | Vitamin E: Death before 4 days of age Nervous: Difficulty walking and standing, 15-30 days of age Reproductive Decreased hatchability. Vitamin A: Slow growth, drowsiness, ad mortality. Respiratory: Discharge from nose and eyes. Reproductive decreased egg numbers and hatching, increased blood spots in eggs. | According to type of vitamin | Supplement vitamins in the water or feed. Add antioxidants to feed. Rotate feed. |
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Charlton, B.R. (Ed.) 2006. Avian Disease Manual, Sixth Edition. The American Association of Avian Pathologists. Athens, Georgia.
Say, R.R. 1989. Manual of Poultry Production in the Tropics. CAB International.
Swayne, D.E., Glisson, J.R., Jackwood, M.W., Person, J.E., and Reed, W.M., (Eds.) 1998. A Laboratory Manual for the Isolation and Identification of Avian Pathogens, Fourth Edition. The American Association of Avian Pathologists. Kennett Square, Pennsylvania.