2014 SEVPAC Case #63 (Slide ID: #1)

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1 2014 SEVPAC Case #63 (Slide ID: #1) Tuskegee University College of Veterinary Medicine Dr. Ebony Gilbreath

2 Tissues submitted to TUSVM diagnostic services for histopathology Puppies 4 weeks of age From Puerto Rico Tissues from 2 puppies were submitted for histopathologic evaluation Lung Kidney Urinary bladder Spleen Heart Liver Pancreas Small intestine Colon

3 Lung

4 Spleen

5 Heart

6 Kidney

7 Urinary bladder

8

9

10

11

12

13

14 Morphologic Diagnoses Lung: Severe multifocal necrotizing and pyogranulomatous intersitital pneumonia with bronchial and bronchiolar syncytial formation Urinary bladder and Renal pelvis: Numerous intracytoplasmic and rare intranuclear eosinophilic viral inclusions with syncytia formation, transitional epithelium Spleen: Severe diffuse lymphoid necrosis Heart: Moderate multifocal necrotizing myocardidits with dystrophic mineralization

15 Canine Distemper Virus Morbillivirus (Genus) Paramyxoviridae (Family)

16 Species Affected Canines Mustelids Ferrets Minks Raccoons

17 Transmission Respiratory secretions are infectious Inhalation is most common mode of transmission

18 Clinical Disease 5 day incubation period Animals unable to mount an efficient immune response develop clinical disease (secondary infections are common)

19 Clinical Disease Puppies weeks of age In utero infected puppies weeks of age Lymphopenia (B and T lymphocytes affected) Animals that survive the infection are usually immune for life

20 Clinical Disease desinfecciosas/2013/libros/greene%20- %20Infectious%20diseases%20ot%20the%20Dog%20and%20Cat% 203rd%20Ed/03%20Canine%20Distemper.pdf Respiratory Gastrointestinal Neurologic Ocular disease (KCS) Hyperkeratosis (food pads and nasal planum, commonly) Dental defects (enamel hypoplasia common) Abortions

21 Initial Clinical Signs Pyrexia (up to 105 F) Anorexia Depression Serous to seropurulent ocular and nasal discharge Cough (may present like infectious tracheobronchitis)

22 Respiratory Lesions Bronchointerstitial pneumonia Multifocal necrosis and attenuation of bronchiolar epithelium with mild suppurative infiltrate Patchy alveolar necrosis with type II pneumocyte hyperplasia Epithelial syncytia Intranuclear and intracytoplasmic viral inclusions (peak presence at days; diminished by 5-6 weeks)

23 Nervous Lesions Demyelination Cerebellum Rostral medullary velum Surrounding the 4 th ventricle Optic tracts Spinal cord Neuronal viral inclusions (usually intranuclear) Neuronal necrosis Gliosis Nonsuppurative meningoencephalitis

24

25 Old Dog Encephalitis Rare sequelae of previous canine distemper virus infection Chronic, progressive neurologic disease Widely distributed perivascular nonsuppurative inflammation Viral inclusions in neurons and astrocytes Exact pathogenesis is unknown

26 Dermatitis and Hyperkeratosis Vesicular and pustular dermatitis may occur with wide spread dissemination of the virus Secondary infection with Staphylococcous sp. is common Hyperkeratosis of the footpad ( Classic )

27 Other lesions Mild degenerative changes, mononuclear cell infiltrates, and viral inclusions in epithelial cells of other organs can occur Stomach Gall bladder Pancreatic ducts Urinary bladder Renal pelvis Epididymis Testes

28 Very Common and Characteristic Lesion to Aid in Histopathologic Diagnosis Urinary bladder and renal pelvis viral inclusions***

29 Questions??

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