Rickettsia are small intracellular bacteria that inhabit arthropods.
There are 5 types of rickettsial diseases:
- Scrub typhus.
- Rocky mountain spotted fever.
- Trench fever.
- Q fever.
The main pathology is vasculitis (inflammation of the blood vessels).
The clinical picture includes the following symptoms:
Orbital pain & headache & meningeo-encephalitis.
Rash (measles like).
Other organs: hepato-splenomegaly, lymph node enlargement, pneumonia.
Diagnosed by Weil-Felix test.
All other types similar to above.
Caused by the organism Coxiella burnetti, no vector is needed.
Clinical picture: Petechial rash, atypical pneumonia, hepatitis.
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