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Contact Info
Infectious Disease Epidemiology, Prevention and Control Division
651-201-5414
IDEPC Comment Form

Contact Info

Infectious Disease Epidemiology, Prevention and Control Division
651-201-5414
IDEPC Comment Form

Anaplasmosis, 2016

Human anaplasmosis, caused by Anaplasma phagocytophilum, is a rickettsial disease transmitted to humans by bites from Ixodes scapularis (the blacklegged tick or deer tick).

Although Anaplasmosis was initially referred to as human granulocytic ehrlichiosis, anaplasmosis and ehrlichiosis (due to Ehrlichia chaffeensis) are distinct diseases caused by different rickettsial species. The same tick vector also transmits the etiologic agents of Lyme disease, babesiosis, ehrlichiosis (due to Ehrlichia muris), and a strain of Powassan virus. A. phagocytophilum can also be transmitted by blood transfusion.

In 2016, 733 confirmed or probable cases of anaplasmosis (13.4 cases per 100,000 population) were reported, up from the 613 cases reported in 2015 (Figure 1). Despite annual fluctuations in reported cases, the overall trend is an increase in yearly case totals over time. Four hundred forty-nine (61%) cases reported were male. The median age of cases was 59 years (range, 2 to 97 years), 10 years older than the median age of Lyme disease cases. As is typical, most cases had illness onsets during the summer months, with 59% of cases reporting illness onsets in June and July. In 2016, 203 (28%) cases were hospitalized at some point for their infection, with a median duration of 4 days (range, 1 to 22 days).

  • For up to date information see>> Anaplasmosis
  • Full issue>> Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2016
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Last Updated: 10/20/2022

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