Infectious Disease Compendium



Gram negative coccobacillus, includes P. canis, P. dagmatis (sounds like something an ornery Walter Brennan would say), P. multocida ssp. multocida, P. multocida ssp. septica, P. stomatis and a bunch of others.

Epidemiologic Risks

Found in dogs (20%) and cats (50%) mouths as well as pigs, rats, buffaloes and other animals. Really. Check out zoonosis for the skinny.


Infection usually starts within 24 hours of bite, it most commonly causes a bite infection. However, given the fact that people let their pets lick them anywhere, you can find the organisms anywhere. I had a case of meningitis in a patient whose cat liked to lick her nose and she put tuna on the nose to encourage the cat. Ick.

CAPD peritonitis (PubMed). I had a case in a patient whose cat liked to sleep in her bag warmer.

And many foot infections in patient who walk about barefoot in a house full of vermin, er, I mean cats.

A case of UTI in an old man who got if from the dog. How I do not know.


Penicillin G OR ampicillin OR amoxicillin OR third generation cephalosporins OR tetracycline OR quinolone.

Avoid: first and second generation cephalosporins, macrolides.


Have low threshold of involving a hand surgeon if a bite. Unless, of course, the infection in not on the hand.

It is named after Louis Pasteur, who first identified it as the cause of chicken cholera. His name is immortalized as chicken shit? Some honor.

Curious Cases

Relevant links to my Medscape blog

Lookin' Good

Dog or Cat?

Dawg Bite


No Other Explanation

Last Update: 06/02/18.