Tickborne pathogen surveillance

Map of U.S. showing counties with lyme disease spirochetes. Most cases are located in the northeastern US.

Reported distribution of counties where Lyme disease spirochetes have been identified.  Counties classified as “present” are those where Borrelia burgdorferi sensu stricto or Borrelia mayonii have been identified in one or more host-seeking Ixodes scapularis or Ixodes pacificus ticks, using species-specific molecular methods.

Map of the US showing reported distribution of counties where Lyme disease spirochetes have been identified.

Reported distribution of counties where Lyme disease spirochetes have been identified.  Counties classified as “present” are those where Borrelia burgdorferi sensu stricto or Borrelia mayonii have been identified in one or more host-seeking Ixodes scapularis or Ixodes pacificus ticks, using species-specific molecular methods.

Distribution of Borrelia miyamotoi in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Distribution of Borrelia miyamotoi in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Reported distribution of counties where Borrelia miyamotoi (hard tick relapsing fever) spirochetes have been identified. Counties classified as “present” are those where B. miyamotoi has been identified in one or more host-seeking Ixodes scapularis or Ixodes pacificus ticks, using species-specific molecular methods.

Distribution of Anaplasma phagocytophilum in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Distribution of Anaplasma phagocytophilum in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Reported distribution of counties where Anaplasma phagocytophilum (anaplasmosis) has been identified. Counties classified as “present” are those where A. phagocytophilum has been identified in one or more host-seeking Ixodes scapularis or Ixodes pacificus ticks, using species-specific molecular methods.

Distribution of Ehrlichia muris eauclairensis in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Distribution of Ehrlichia muris eauclairensis in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Reported distribution of counties where Ehrlichia muris eauclairensis has been identified. Counties classified as “present” are those where E. muris eauclairensis has been identified in one or more host-seeking Ixodes scapularis ticks, using species-specific molecular methods.

Distribution of Babesia microti in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Distribution of Babesia microti in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Reported distribution of counties where Babesia microti (babesiosis) has been identified. Counties classified as “present” are those where Ba. microti has been identified in one or more host-seeking Ixodes scapularis ticks, using species-specific molecular methods.

Distribution of Powassan Virus in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Distribution of Powassan Virus in host-seeking Ixodes scapularis and Ixodes pacificus ticks, 2021

Reported distribution of counties where Powassan virus has been identified. Counties classified as “present” are those where Powassan virus has been identified in one or more host-seeking Ixodes scapularis ticks, using species-specific molecular methods.