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Diseases of Poultry II.

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1 Diseases of Poultry II.

At the farm before transportation to the slaughterhouse the poultry flock must be examined by veterinarian. A certificate must be composed on the results of this inspection and the pre-life of the flock If the certificate is available – and it is negative – and it does not indicate the necessity of special measures, the ante mortem inspection at the slaughterhouse will include the identification of transported flock and control of injuries took place during transportation, furthermore the examination of dead birds. Based on these data and examinations the veterinarian decides whether the flock will be submitted to normal or special slaughter or further special examination.

3 HUNGARIAN ZOO SANITARY CODE 41/1997. (V. 28. ) FM. r
HUNGARIAN ZOO SANITARY CODE 41/1997.(V. 28.) FM. r. Notifiable Diseases O.I.E. list A Newcastle disease (Paramyxovirus) Avian influenza (Orthomyxovirus) Duck plaque (Herpesvirus)

4 Viral Diseases Newcastle disease Avian influenza Fowl pox
Infectious bronchitis Infectious laryngotracheitis Infectious bursitis Marek's disease

5 Newcastle disease Notifiable disease !
Avian paramyxovirus (serotype 1, 8 genotypes) different pathogenity (v, m, l, a) chicken, pheasant, turkey, pigeon, wild birds (water fowl) Sensitivity: 56 °C - 3 min pH min disinfectant

6 Clinical signs: respiratory disease enteritidis nervous signs marked drop in egg production
Pathology: haemorrhages on seromembranes, on mucosal membranes (proventriculi, small intestine, ceca, -lymphoid tonsils -, trachea, pharynx) enteritidis diphtheriod inflammation on lymphoid tonsils on pharynx



9 Isolation of virus (pathogenicity) Prevention / Vaccination
Differential diagnosis (septicaemia, CRD, IBD, ILT, IB, Fowl pox, pneumovirus, coccidiosis, mycotoxicosis)

10 if NDV is observed on the farm:
In compliance with EU directive 93/119/EC, depopulation of infected flocks may take place using the following methods/drugs/systems: Electronarcosis by water dipping Decapitation and dislocation of the neck Gassing with carbon dioxide Vacuum tank if NDV is observed in the slaughter-house everything is condemned, and everything has to be desinfected

11 Fowl pox Poxviridae, Avipox
Sensitivity: 50°C heating 30 min °C min in dry scabs for months/years pH 5-9 resistant

12 special histopathological changes (cytoplasmic inclusion body)
cutaneous form nodular (proliferative) lesions on the comb, wattle, eyelids, other non feathered areas diphtheroid form nodules on mucosal membranes of pharynx, trachea, oesophagus special histopathological changes (cytoplasmic inclusion body)



15 Infectious Laryngotracheitis
Herpesvirus Sensitivity: mild (halogen-detergents + iodophors, heating, but (-18° C-25° C !) Acute respiratory disease Conjunctivitis Laryngitis Tracheitis (Histopathology: intranuclear inclusion body in epithelial cells by 3 day PI)



18 Infectious bronchitis
Coronavirus Sensitivity: 56°C 15 min at room temperature 2-3 days common detergents destroy Pathology: acute catarrhal tracheitis, bronchitis sinusitis, air sacculitis local pneumonia nephritis, salpingitis (eggs !)



21 Infectious bursal Disease (Gumboro Disease)
Birnavirus bursa Fabricii (B lymphoid cells) immunsuppression ! Sensitivity: very stabil virus! °C -30 min % chloramines 10 min invert soap + 0,05 sodium hydroxide

22 Pathology: haemorrhages. in muscles (legs, breast)
Pathology: haemorrhages in muscles (legs, breast) on mucosal membrane of proventriculi on lymphoid tonsils of intestine oedema and haemorrhageous inflammation of bursa Fabricii Diff. diagnosis: Newcastle disease mycotoxicosis Prevention: vaccination, hygiene


24 Marek’s Disease Herpesvirus (cell associated virus) Sensitivity: 
Pathogenity: „classical” form (lesions in peripheral nerves) tumoral form (lymphoid tumors in different organs or in skin) transient paralysis Differential diagnosis: Newcastle disease leucosis tumors





29 Parasites / Protozoa Coccidiosis
Eimeria tenella Eimeria necatrix Eimeria acervulina Eimeria truncata Chicken, turkey geese Anticoccidial drugs /vaccination immunsuppressive diseases (Marek’s disease, CAV, Gumboro disease, Reo, mycotoxines…)

30 renal coccidiosis (enlarged, yellow-greyish kidneys)
Haemorrhagic enteritidis (clotted blood - fibrinous inflammation) in caecum in small intestines renal coccidiosis (enlarged, yellow-greyish kidneys)


32 Fungal infections Aspergillosis
Aspergillus fumigatus Aspergillus flavus Penicillium Mucor Respiratory disease pneumonia (granulomes) air sacculitis, peritonitis Litter, feed (toxins) (Antibiotics contraindicated!)


34 In these cases poultry meat is partial condemned for human consumption
(the effected areas are condemned: - parenchymal orgams intestines skin + muscles /breast, legs/ )

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