Rickettsial or Vector-Borne Flashcards
Which rickettsial diseases tend to cause rashes?
Rickettsiae ricketsii, Rickettsia typhi, R. prowazekii.
What is the vector for Rickettsiae ricketsii?
Tick
What is the vector for R. typhus?
Fleas.
What is the vector for R. prowazekii?
Human body louse.
Where does RMSF commonly occur?
South Atlantic states, especially North Carolina.
Where does the RMSF rash occur? What are the other sx?
Ricketsii starts at wRists and ankles, spreads to trunk, palms, soles. Fever, conjunctival infection, severe headache.
Where does the R. typhus rash occur?
Typically Typhus starts on the Trunk.
Which Rickettsiae is associated with epidemics?
R. prowazekii proWOKES an epidemic.
Which closely related to rickettsia genus species is NOT vector borne?
Coxiella burnetti has no arthrpod vector or rash.
How is coxeilla burnetti transmitted?
Spores inhaled as aerosols from cattle/sheep/amniotic fluid.
What is the presenation of coxiella burnetti?
Q fever - pneumonia, culture negative endocarditis.
What is hte vector for ehrlichiosis?
Tick.
How does Ehrlichiosis appear histologically?
Monocytes with morulae - berry like inclusions in cytoplasm.
What is the presentation of Ehrlichiosis
Similar to RMSF but no rash - fever, conjunctival infxn, severe headache.
What is the reservoir of ehrlichiosis?
deer, dogs, coyotes
