Canine Adenovirus 1
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Causes Infectious Canine Hepatitis
Hosts
- Dogs
- Foxes are very susceptible (Fox Encephalitis)
Pathogenesis
- Infects and replicates in the oropharynx
- Viremia as the virus reaches endothelial cells
- Attacks the endothelial lining of gall bladder, liver sinusoids, and Kuppfer cells
- Resulting heptatitis is followed by severe abdominal pain and often death
- Post Mortem: swollen, hemorrhagic liver, ascites, and oedema of the gall bladder
- In older dogs, may present more mildly with lymph node enlargement and chronic interstitial nephritis
- In foxes: virus replicates in the endothelia of the brain resulting in neuronal damage, fits, and paralysis
Epidemiology
- Transfers easily via ingesting infected urine, feces or respiratory secretions
- Can be transferred by handlers, infected surfaces, etc.
Diagnosis
- Intranuclear inclusion bodies in hepatocytes can be seen under H&E staining
- Vascular endothelium can be stained for viral antigen by immunofluorescence
Control
In an outbreak
- Isolate infected dogs
- Disinfect premises
To prevent
- Vaccination: tissue culture adaptation that may be live or inactivated
- Cross protection with CAV2
- Live vaccines are known to cause keratitis in Afghans, Red Setters and Saluki