Tickborne Pathogen Surveillance

At a glance

  • The maps below show the projected suitable habitat for blacklegged ticks and where select pathogens have been found in blacklegged tick populations.
  • These pathogens have been identified in host-seeking Ixodes scapularis (blacklegged ticks) or Ixodes pacificus (western blacklegged ticks).
Borrelia burgdorferi under a microscope

Lyme disease spirochetes

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U.S. map showing where Borrelia burgdorferi sensu stricto and Borrelia mayonii have been identified in blacklegged ticks
Map showing where Borrelia burgdorferi sensu stricto (s.s.) and Borrelia mayonii have been identified in blacklegged ticks through 2024.

Borrelia miyamotoi

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Image shows a map of the United States highlighting which counties have detected Borrelia miyamotoi in ticks
Map showing where Borrelia miyamotoi has been identified in blacklegged ticks through 2024.

Anaplasma phagocytophilum (human active variant)

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Image shows a map of the United States highlighting which counties have detected Anaplasma phagocytophilum in ticks
Map showing where the human active variant of Anaplasma phagocytophilum has been identified in blacklegged ticks through 2024.

Ehrlichia muris eauclairensis

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Image shows a map of the United States highlighting which counties have detected Ehrlichia muris eauclairensis in Ixodes species ticks
Map showing where Ehrlichia muris eauclairensis has been identified in blacklegged ticks through 2024.

Powassan virus

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Image shows a map of the United States highlighting counties with Powassan virus detected in Ixodes ticks
Map showing where Powassan virus has been identified in blacklegged ticks through 2024.

Babesia microti

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Image shows a map of the United States highlighting which counties have detected Babesia microti in ticks
Map showing where Babesia microti has been identified in blacklegged ticks through 2024.
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