Tickpedia
Tick-borne illness

Powassan virus disease

Powassan virus disease is a rare but severe tick-borne flavivirus infection causing encephalitis, spread by black-legged ticks in the Northeast.

Carried by 3 ticksView risk map →
Continental risk map
Where Powassan virus disease hits hardest
Hexagon heatmap of where Powassan virus disease concentrates — county-level CDC reports bucketed into H3 cells.
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State-by-state cases

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Alaska — no CDC-reported casesAKMaine — no CDC-reported casesMEVermont — no CDC-reported casesVTNew Hampshire — no CDC-reported casesNHWashington — no CDC-reported casesWAIdaho — no CDC-reported casesIDMontana — no CDC-reported casesMTNorth Dakota — no CDC-reported casesNDMinnesota — no CDC-reported casesMNWisconsin — no CDC-reported casesWIMichigan — no CDC-reported casesMINew York — no CDC-reported casesNYMassachusetts — no CDC-reported casesMAOregon — no CDC-reported casesORNevada — no CDC-reported casesNVWyoming — no CDC-reported casesWYSouth Dakota — no CDC-reported casesSDIowa — no CDC-reported casesIAIllinois — no CDC-reported casesILIndiana — no CDC-reported casesINOhio — no CDC-reported casesOHPennsylvania — no CDC-reported casesPANew Jersey — no CDC-reported casesNJConnecticut — no CDC-reported casesCTCalifornia — no CDC-reported casesCAUtah — no CDC-reported casesUTColorado — no CDC-reported casesCONebraska — no CDC-reported casesNEMissouri — no CDC-reported casesMOKentucky — no CDC-reported casesKYWest Virginia — no CDC-reported casesWVVirginia — no CDC-reported casesVAMaryland — no CDC-reported casesMDDelaware — no CDC-reported casesDERhode Island — no CDC-reported casesRIArizona — no CDC-reported casesAZNew Mexico — no CDC-reported casesNMKansas — no CDC-reported casesKSArkansas — no CDC-reported casesARTennessee — no CDC-reported casesTNNorth Carolina — no CDC-reported casesNCSouth Carolina — no CDC-reported casesSCDistrict of Columbia — no CDC-reported casesDCHawaii — no CDC-reported casesHIOklahoma — no CDC-reported casesOKLouisiana — no CDC-reported casesLAMississippi — no CDC-reported casesMSAlabama — no CDC-reported casesALGeorgia — no CDC-reported casesGATexas — no CDC-reported casesTXFlorida — no CDC-reported casesFLCASES · PER STATE
none
most cases

No CDC-reported cases yet for Powassan virus disease.

No CDC-reported cases yet for Powassan virus disease.

Seasonality

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Monthly breakdown not yet imported for Powassan virus disease.

Year-over-year

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Year-over-year totals not yet imported for Powassan virus disease.

Ticks that carry it

3 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.
Groundhog tickIxodes cookeiThe groundhog tick feeds primarily on woodchucks and small mammals across the eastern US and is a recognized vector of Powassan virus.
Squirrel tickIxodes marxiThe squirrel tick feeds mostly on tree squirrels in the eastern US and rarely bites humans, but is a known reservoir of Powassan virus.

Pathogens that cause it

1 known
PathogenScientific nameOne-liner
Powassan virusPowassan virusTick-borne flavivirus transmitted by Ixodes scapularis (deer tick virus, lineage II) and I. cookei; causes severe encephalitis with high case fatality.

Wild facts

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