5-Minute Emergency Consult
Ehrlichiosis And Anaplasmosis
Basics
Description
- Tick-borne human infections by obligate intracellular bacteria, presenting as acute febrile illnesses with nonspecific symptoms
Etiology
Human Monocytic Ehrlichiosis (Hme)
- Ehrlichia chaffeensis:
- Vector tick: lone star tick (Amblyomma americanum)
- Geographic distribution: Predominantly southeast, south-central, from the East Coast extending westward to Texas
- E. ewingii:
- Vector tick: Lone star tick (Amblyomma americanum)
- Geographic distribution: Southeastern, south-central, and Midwestern states
- E. muris eauclairensis:
- Vector tick: Blacklegged tick (Ixodes scapularis)
- Geographic distribution: Minnesota, Wisconsin
Human Granulocytic Anaplasmosis (Hga)
- Anaplasma phagocytophilum:
- Vector ticks: Deer tick (I. scapularis), blacklegged tick (I. pacificus)
- Geographic range: Northeastern and upper Midwestern states and northern California
- Frequent coinfections with other diseases transmitted by I. scapularis:
- Lyme disease
- Babesiosis
- Powassan virus
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Citation
Schaider, Jeffrey J., et al., editors. "Ehrlichiosis and Anaplasmosis." 5-Minute Emergency Consult, 7th ed., Wolters Kluwer, 2027. Emergency Central, emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307397/all/Ehrlichiosis_And_Anaplasmosis.
Ehrlichiosis And Anaplasmosis. In: Schaider JJJ, Barkin RMR, Hayden SRS, et al, eds. 5-Minute Emergency Consult. Wolters Kluwer; 2027. https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307397/all/Ehrlichiosis_And_Anaplasmosis. Accessed July 10, 2026.
Ehrlichiosis And Anaplasmosis. (2027). In Schaider, J. J., Barkin, R. M., Hayden, S. R., Wolfe, R. E., Barkin, A. Z., Shayne, P., & Rosen, P. (Eds.), 5-Minute Emergency Consult (7th ed.). Wolters Kluwer. https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307397/all/Ehrlichiosis_And_Anaplasmosis
Ehrlichiosis and Anaplasmosis [Internet]. In: Schaider JJJ, Barkin RMR, Hayden SRS, et al, eds. 5-Minute Emergency Consult. Wolters Kluwer; 2027. [cited 2026 July 10]. Available from: https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307397/all/Ehrlichiosis_And_Anaplasmosis.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC
T1 - Ehrlichiosis And Anaplasmosis
ID - 307397
ED - Barkin,Adam Z,
ED - Shayne,Philip,
ED - Rosen,Peter,
ED - Schaider,Jeffrey J,
ED - Barkin,Roger M,
ED - Hayden,Stephen R,
ED - Wolfe,Richard E,
BT - 5-Minute Emergency Consult
UR - https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307397/all/Ehrlichiosis_And_Anaplasmosis
PB - Wolters Kluwer
ET - 7
DB - Emergency Central
DP - Unbound Medicine
ER -
