Ahead of Print -Human Babesiosis, Maine, USA, 1995–2011 - Volume 20, Number 10—October 2014 - Emerging Infectious Disease journal - CDC
Volume 20, Number 10—October 2014
Human Babesiosis, Maine, USA, 1995–2011
Babesiosis caused by Babesia microti is a potentially life-threatening parasitic infection transmitted by Ixodes scapularis, the deer, or black-legged, tick; it is of increasing concern as a transfusion-acquired illness (1,2). Since its recognition on Nantucket Island and Cape Cod, Massachusetts, USA, during the 1970s (3), human babesiosis from B. microti infection has become a public health threat in an increasing number of foci in the northeastern and upper midwestern United States (1). Risk for infection by B. microti remains geographically more localized than for other pathogens transmitted by I. scapularis ticks, such as Borrelia burgdorferi (4–6). This localization may be associated with dense populations of I. scapularis ticks and high prevalence of B. burgdorferi in ticks (6,7). Therefore, entomologic data may help predict risk for human babesiosis (6).
The presence of B. microti–infected ticks in Maine was first documented in 1995 from a town in which Lyme disease was endemic (7,8). The first case of human babesiosis reported in Maine occurred in 2001, 15 years after the first case of Lyme disease occurred in the state (8,9). A transfusion-associated case of babesiosis in2007 originated from a blood donor in Maine (10). We report on the geographic and temporal expansion of babesiosis in Maine, entomologic correlates of its emergence, and the seroprevalence of Babesia spp. in blood donors from the 2 southernmost coastal counties.
Dr Smith is Program Director of Infectious Disease at the Maine Medical Center, co-director and co-principal pnvestigator of the Vector-borne Disease Laboratory at the Maine Medical Center Research Institute, and Clinical Professor of Medicine at Tufts University School of Medicine. He has a long-standing interest in the epidemiology and ecology of vectorborne diseases.
We thank numerous volunteers and technicians who collected ticks in the field, and scientists who tested ticks in several laboratories. We thank Jacquelyn Hedlund of Maine Center for Cancer Medicine and Bruce Cahill of the Maine Medical Center; the staff of Coral Blood Services, Inc. (formerly of Scarborough, Maine); Anne Breggia, Elizabeth McMenamin, and Ellen McMonagle of the Maine Medical Center Research Institute Research Laboratory Services Core Facility; Diane Caporale of the University of Wisconsin-Stevens Point; Peter Krause and Lindsay Rollend of the Yale University School of Public Health, and Carol Mariani of the DNA Analysis Facility at Yale University. We thank the Maine Center for Disease Control for data and Linda B. Turcotte for administrative support. We also thank the numerous private landowners, land trusts, and town governments, and the Wells National Estuarine Reserve and the State of Maine for access to private and public lands for field collections. The Mentored Research Committee of the Maine Medical Center Research Institute provided financial support for portions of this study.
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Suggested citation for this article: Smith RP Jr, Elias SP, Borelli TJ, Missaghi B, York BJ, Kessler RA, et al. Human babesiosis, 1995–2011, Maine, USA. Emerg Infect Dis. 2014 Oct [date cited]. http://dx.doi.org/10.3201/eid2010.130938
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