Tickpedia
Tick-borne illness

Anaplasmosis

Anaplasmosis is a bacterial infection (Anaplasma phagocytophilum) spread by black-legged ticks across the Northeast, Upper Midwest, and Pacific Coast.

Cases · 33,518Carried by 4 ticksPeak · JuneView risk map →
Continental risk map
Where Anaplasmosis hits hardest
H3 hexagon heatmap of 33,518 reported cases across 51 states.
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State-by-state cases

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Alaska — no CDC-reported casesAKMaine — 3,143 casesMEVermont — 2,685 casesVTNew Hampshire — 1,753 casesNHWashington — 10 casesWAIdaho — no CDC-reported casesIDMontana — 5 casesMTNorth Dakota — 74 casesNDMinnesota — 2,431 casesMNWisconsin — 3,943 casesWIMichigan — 190 casesMINew York — 10,279 casesNYMassachusetts — 2,960 casesMAOregon — 9 casesORNevada — 1 caseNVWyoming — 1 caseWYSouth Dakota — 7 casesSDIowa — 87 casesIAIllinois — 110 casesILIndiana — 16 casesINOhio — 40 casesOHPennsylvania — 2,142 casesPANew Jersey — 653 casesNJConnecticut — 1,185 casesCTCalifornia — 68 casesCAUtah — 3 casesUTColorado — no CDC-reported casesCONebraska — 6 casesNEMissouri — 82 casesMOKentucky — 8 casesKYWest Virginia — 13 casesWVVirginia — 120 casesVAMaryland — 105 casesMDDelaware — 26 casesDERhode Island — 849 casesRIArizona — 19 casesAZNew Mexico — no CDC-reported casesNMKansas — 32 casesKSArkansas — 79 casesARTennessee — 72 casesTNNorth Carolina — 80 casesNCSouth Carolina — no CDC-reported casesSCDistrict of Columbia — 1 caseDCHawaii — no CDC-reported casesHIOklahoma — 12 casesOKLouisiana — 6 casesLAMississippi — 7 casesMSAlabama — 48 casesALGeorgia — 3 casesGATexas — 17 casesTXFlorida — 138 casesFLCASES · PER STATE
none
most cases

33,518 reported cases across 51 states.

Top 8 states
#NameCases
1New York10,279
2Wisconsin3,943
3Maine3,143
4Massachusetts2,960
5Vermont2,685
6Minnesota2,431
7Pennsylvania2,142
8New Hampshire1,753

Seasonality

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JFMAMJJASOND

Cases peak in June — about 4,964 cases reported.

MonthCases
Jan89
Feb71
Mar191
Apr746
May2,558
Jun4,964
Jul4,276
Aug1,647
Sep737
Oct1,252
Nov1,305
Dec223

Year-over-year

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19,82514,8699,9134,956020192022REPORTED CASES · PER YEAR

Ticks that carry it

4 known
TickScientific nameOne-liner
Blacklegged tickIxodes scapularisThe black-legged tick is the primary US vector of Lyme disease, established across the Northeast, Upper Midwest, and Mid-Atlantic.
Castor bean tickIxodes ricinusThe castor bean tick is the principal European vector of Lyme borreliosis and tick-borne encephalitis, ranging from Britain to the Caspian.
Pacific Coast tickDermacentor occidentalisThe Pacific Coast tick is found from Oregon to Baja California and transmits Pacific Coast tick fever, a 364D rickettsiosis.
Western blacklegged tickIxodes pacificusThe western black-legged tick carries Lyme disease and anaplasmosis along the Pacific Coast from California to British Columbia.

Pathogens that cause it

1 known
PathogenScientific nameOne-liner
Anaplasma phagocytophilumAnaplasma phagocytophilumIntracellular bacterium that causes anaplasmosis (formerly human granulocytic ehrlichiosis); carried by Ixodes scapularis and I. pacificus.

Wild facts

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