Table 96-1.

Viral Infections to Be Included on the List of Differential Diagnosis in Dogs and Cats with Respiratory, Gastrointestinal, or Neurologic Symptoms

	Affected Body System
Species	Respiratory	Gastrointestinal	Neurologic
Dog	Canine distemper Influenza viruses Canine parainfluenza Canine adenovirus Canine herpesvirus Canine respiratory coronavirus Possibly other viruses such as canine pneumovirus	Canine distemper Canine parvovirus Canine enteric coronavirus Rotaviruses, astroviruses, adenoviruses, caliciviruses, and several other novel viruses such as norovirus	Canine distemper Rabies Arthropod-borne infections (togaviruses, bunyaviruses, and flaviviruses)*
Cat	Feline calicivirus Feline herpesvirus Feline infectious peritonitis Influenza viruses Retroviruses†	Feline panleukopenia Feline coronavirus Rotavirus Retroviruses1	Feline panleukopenia Feline infectious peritonitis Rabies FIV Retroviruses† Paramyxoviruses

FIV, Feline immunodeficiency virus.

^*These also have the potential to cause disease in cats, but disease has been reported more often in dogs. Most animals are infected subclinically.

^†Feline retrovirus infections also may be associated with these signs through induction of neoplastic disease or secondary infections resulting from immunosuppression.