A relatively mild, usually flea-borne form of typhus caused by Rickettsia typhi, of which rats are the major natural reservoir (also called endemic typhus). Also (occasionally): infection of a rat or other mammal by R. typhi.
murine typhus/ˌmjʊərʌɪn ˈtʌɪfəs/ /ˌmjɔːrʌɪn ˈtʌɪfəs/ /ˌmjʊərɪn ˈtʌɪfəs/
1930s; earliest use found in Biological Abstracts. From murine + typhus, after French typhus murin.