This chapter is divided into four parts:

  1. Viral respiratory disease . The majority of cases of infectious respiratory disease in cats are caused by one of two viruses, feline calicivirus (FCV) or feline herpesvirus (FHV) (feline rhinotracheitis virus).
  2. Feline Chlamydia psittaci infection. This organism mainly induces conjunctivitis, though mild respiratory signs may also be present.
  3. Bordetella bronchiseptica infection. B. bronchiseptica is undoubtedly important in secondary infections, but recently evidence has been accumulating that it may also be important as a primary pathogen in cats.
  4. Mycoplasma infection. Again these are most likely to be important as secondary invaders, but a more primary role has been suggested by some.

Other viruses with only suspected or peripheral involvement include feline reovirus , cowpox virus and feline coronavirus .

Other bacteria such as staphylococci, streptococci, pasteurellae and coliforms are also important as secondary invaders.

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