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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, 2017

Anaplasmosis, caused by Anaplasma phagocytophilum, is a rickettsial disease transmitted by bites from Ixodes scapularis, the blacklegged tick. Although the organism that causes anaplasmosis was previously known by other names and thought to be a part of the genus Ehrlichia, anaplasmosis and ehrlichiosis (due to E. 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 E. muris), and Powassan virus. In rare circumstances, A. phagocytophilum may be transmitted by blood transfusion.

In 2017, 638 confirmed or probable cases of anaplasmosis (11.6 cases per 100,000 population) were reported, down from the 733 cases reported in 2016 (Figure 1). Despite some annual fluctuations in reported cases, the overall trend is an increase in yearly case totals over time, with a median of 632 cases reported per year since 2010. Sixty percent (385) of cases reported were male. The median age of cases was 58 years (range, 2 to 97), 15 years older than the median age of confirmed Lyme disease cases. As is typical, most cases had illness onsets during the summer months, with 65% of cases reporting illness onsets in June and July. In 2017, 165 (26%) cases were hospitalized for their infection, with a median duration of 4 days (range, 1 to 34 days).

  • For up to date information see>> Anaplasmosis
  • Full issue>> Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2017
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Last Updated: 10/20/2022

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