Rickettsia typhi . It causes endemic or flea-borne typhus. Clinical Features: It is transmitted to man when bitten by an infected rat-flea.
The disease is milder than louse-borne typhus and occurs in those individuals living or working in highly rat-infested area. Laboratory diagnosis: Specimen: Serum for serological tests The serological tests to diagnose typhus are:
Indirect fluorescent antibody test
Complement fixation test
Weil –felix reaction: Some of the antigen of Proteus strain
(OX-19, withsera from
Treatment: Tetracycline Chloramphenicol
2.8. GENUS: MYCOPLASMA