Deer tick
Deer Tick

Behaviors of Ticks that Carry It

Babesiosis is carried by deer ticks and found where Lyme disease is common.


Babesiosis incidence map


Infectious Disease Alert Babesiosis — Increase in Reported Cases in the United States Aug, 2019 Babesiosis reports ranged from 909 in 2012 to 2,074 in 2015.  … 94.5% of cases were in seven states, (New York, Massachusetts, Connecticut, New Jersey, and Rhode Island) and two from the Upper Midwest (Wisconsin and Minnesota). The only other states reporting more than 100 cases were Maine and New Hampshire, where cases increased over the years of the study. Overall, > 70% of cases had onset during June to August.

CDC Morbidity and Mortality Weekly Report Babesiosis Surveillance — United States, 2011–2015 May 31, 2019 As of 2015, Reported cases occurred most frequently during June–August in the Northeast and upper Midwest. Maine and New Hampshire reported increasing numbers of cases over time Hospitalizations were common, particularly among patients who were asplenic or elderly….Note - Doxycycline, which is not recommended for treatment of babesiosis, was specified for 1,320 (48.4%) of the 2,728 patients.