1. IN THE NAME OF GOD

2. برترین وبزرگترین انجمن مجازی دامپزشکان کشور

3. انجمن واتس آپ دامپزشکان

5. دانلود نرم افزار های دامپزشکی تلفن همراه

6. مشاوره رایگان دامپزشکان در مسایل حقوقی

7. NECROTIC LARYNGITIS
CALF DIPHTHERIA, LARYNGEAL NECROBACILLOSIS

8. Bovine (calf) calf diphtheria (Gram stain - paraffin sect)

10. Definition
Acute to chronic infection of the laryngeal mucosa and cartilage of young cattle is very common, particularly in feedlots.

11. Etiology
Laryngeal contact ulcers probably provide a damaged mucosal surface, which then allows invasion of the cartilage by F. necrophorum, which is the proximate cause of the lesions.

12. Clinical Signs most commonly in calves from 3 to 18 months of age
moist,painful cough
severe inspiratory dyspnea
open-mouth breathing
loud guttural stertor
neck extended
anorexia
depression
fever
hyperemic mucous membranes
bilateral nasal discharge and a fetid odor to the breath
The larynx may be visibly or palpably swollen
many calves will die in 2 to 7 days as a result of systemic effects of bacterial toxins and upper airway obstruction.

13. Differential Diagnosis
pharyngeal trauma
severe viral laryngitis (e.g., IBR)
actinobacillosis,
laryngeal edema
abscesses
paralysis
tumors

15. Diagnosis
The diagnosis is usually made presumptively based on clinical signs alone. A laryngoscopic or endoscopic examination can help confirm the diagnosis
Acute cases show changes in the CBC consistent with any acute septic condition: leukopenia caused by neutropenia with a left shift

16. Necropsy Lesions arytenoid cartilages Edema Hyperemia
swelling of the mucous membrane around a necrotic ulcer
In chronic cases the lesions consist of a focus of necrotic cartilage surrounded by purulent exudate

18. Treatment Tracheostomy Oxytetracyclin procaine penicillin G
Sulfonamide
Streptomycin
Tylosin
Tracheostomy

19. Control There are no specific control measures
control other respiratory diseases

20. شما همیشه آنچه را در خواست می کنید به دست نمی آورید،اما آنچه را در خواست نمی کنید ،هیچ وقت به دست نمی آورید (فرانکلین برد)
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