Infectious Disease Compendium

Spirillum minor


Thick, gram-negative, coiled, spiral rod.

Epidemiologic Risks

Bit by an Asian rat.


One of the two causes of Rat Bite Fever.

The bite heals then 1 to 4 weeks later becomes painful, swollen, and purple then progresses to ulceration and eschar; it is associated with regional lymphangitis and lymphadenitis. Then fever, chills, headache, and malaise. There is a rash and a relapsing fever lasting 3 to 4 days with afebrile periods of 3 to 9 days. It can cause a variety of focal infections.


2 weeks of iv penicillin.


ICD9 Codes (Soon to be supplanted by ICD10)

Spirillum minor 026.0.