Anaplasmosis/Ehrlichiosis
Anaplasmosis
(Anaplasma phagocytophilum infection)
Anaplasmosis is an illness caused by the bacterium Anaplasma
phagocytophilum, previously known as human granulocytic ehrlichiosis
(HGE). Anaplasmosis is transmitted to humans through the bite of an
infected deer or blacklegged tick (Ixodes scapularis), the same
tick that causes other tickborne diseases in Wisconsin including Lyme
disease. Illness occurs within 1-3 weeks after exposure to an infected
tick. Symptoms include fever, chills, muscle pain, severe headache, and
fatigue. If not treated, anaplasmosis can lead to serious and occasionally
fatal illness. Anaplasmosis is the second most reported tickborne disease
in Wisconsin.
Ehrlichiosis
(Ehrlichia chaffeensis, Ehrlichia ewingii and Ehrlichia
muris-like infection)
Ehrlichiosis is an illness caused by several species of Ehrlichia (E.
chaffeensis, E. ewingii and Ehrlichia muris-like). In Wisconsin,
ehrlichiosis is transmitted to humans through a bite of an infected deer
or blacklegged tick (Ixodes scapularis), the same tick that causes
other tickborne diseases. Since 2008, there has been an increase in
reported cases of ehrlichiosis in Wisconsin. A new Ehrlichia
species (Ehrlichia muris-like) was discovered in Wisconsin and
Minnesota in 2009. Illness usually occurs between 5-10 days after exposure
to an infected tick. Symptoms may include fever, chills, muscle pain
severe headache, and fatigue. Other less common signs and symptoms may
include nausea, vomiting, diarrhea, joint pains, confusion, and rash.
Ehrlichiosis can be more severe than anaplasmosis and may involve the
central nervous system, causing life-threatening complications. The number
of reported ehrlichiosis cases is much lower than anaplasmosis in
Wisconsin.
General Information
Anaplasmosis
/ Ehrlichiosis fact sheet (PDF, 12 KB)
Additional
resources
CDC
Anaplasmosis (Exit DHS)
CDC Ehrlichiosis
(Exit DHS)
Contacts
Diep
Hoang Johnson Vectorborne Disease Epidemiologist
WI Division of Public Health
Bureau of Communicable Diseases & Emergency Response
(Phone 608-267-0249) (Fax 608-261-4976)
Wisconsin
Local Public Health Department or Tribal Agency
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Last Revised: February 02, 2012
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