RICKETTSIA ROCKS 👍 Flashcards
Vector: mites
RICKETTSIA AKARI
RICKETTSIAL POX
Vector: lice
Rickettsia prowazekii
EPIDEMIC TYPHUS
Vector: fleas
Rickettsia typhi
ENDEMIC TYPHUS
NO ARTHROPOD VECTOR
Transmitted by fomites
Weil Felix negative
Triad: fever, vasculitic rash, headache
COXIELLA BURNETTI
Q FEVER
Vector: ticks (lonestar)
SSX: anemia, thrombocytopenia, flu-like ds
EHRLICHIA CHAFFENSIS
EHRLICHIOSIS
Dermacentor tick
Triad: fever, “inward rash”, tick bite
Weil Felix Test
Rickettsia rickettsi
ROCKY MOUNTAIN SPOTTED FEVER
Vector: mites
Ushi
ORIENTIA TSUTSUGAMUSHI
SCRUB TYPHUS
Systemic infection and prostration are severe
2 weeks fever
FATAL!
EPIDEMIC TYPHUS
RICKETTSIA PROWAZEKII
Disease is milder
Rarely fatal except in elderly patients
ENDEMIC TYPHUS
RICKETTSIA TYPHI
ESCHAR
Generalized lymphadenopathy and lymphocytosis
SCRUB TYPHUS
ORIENTIA TSUTSUGAMUSHI
Small wild rodents and larger wild and domestic animals
Hars ticks dermacentor
Invades endothelial lining of capillaries (VASCULITIS)
East coast
2-12 days incubation
Headache, fever, malaise, myalgia, toxicity, vomiting, confusion
MACULOPAPULAR RASH
GI symptoms, periorbital swelling, stiff neck, conjunctivitis and arthralgias
DX: sypmtoms and tick bite
TX: start without laboratory confirmation
DOXYCYCLINE!!
Tick protection and prompt removal
ROCKY MOUNTAIN SPOTTED FEVER
Punched out ulcer covered with a blackened scab that indicates the location of the mite bite
ESCHAR
ALL GRAM NEGATIVE
ALL OBLIGATE INTRACELLULAR PARASITES
ALL TRANSMITTED TO HUMANS BY ARTHROPODS except Q fever
ALL FEVER, RASHES AND VASCULITIS except Q fever and Ehrlichiosis
Rickettsia
Coxiella
Ehrlichia
Domestic livestock
Inhalation of aerosols of urine, feces, amniotic fluid, placental tissue, endospores in milk
Tx: DOXYCYCLINE, ERYTHROMYCIN
Coxiella
Reservoir ticks and deers
Transmitted by the lonestar tick
Ehrlichia chaffensis
