Beyond Lyme: Other Tick-Borne Illnesses in Westchester County
Westchester County residents face exposure to five tick-borne diseases, not just Lyme. Learn to recognize anaplasmosis, babesiosis, Powassan virus, and RMSF — and why early diagnosis matters.
Michael Corsetti
Westchester Has Five Tick-Borne Diseases. Most People Know One.
Westchester County is consistently ranked among the highest-risk counties in the United States for Lyme disease. That fact is well-publicized, and awareness of Lyme's bullseye rash and joint pain symptoms has improved considerably over the past two decades. What receives far less public attention is that the same blacklegged tick population that transmits Lyme also carries four other pathogens — and that two of them (Powassan virus and Babesiosis) can be life-threatening even with rapid treatment.
The five tick-borne diseases documented in Westchester County residents:
- Lyme disease — Borrelia burgdorferi
- Anaplasmosis — Anaplasma phagocytophilum
- Babesiosis — Babesia microti
- Powassan virus disease — Powassan virus, lineage II
- Rocky Mountain Spotted Fever (RMSF) — Rickettsia rickettsii (carried by dog tick)
Disease Comparison Guide
| Disease | Transmission Time | Onset After Bite | Key Symptoms | Severity |
|---|---|---|---|---|
| Lyme Disease | 36–48 hours | 3–30 days | Bullseye rash (70%), fatigue, fever, joint pain | Moderate–Severe if untreated |
| Anaplasmosis | 24–48 hours | 1–2 weeks | Fever, headache, muscle aches — NO rash typically | Moderate — responds well to doxycycline |
| Babesiosis | 36–48 hours | 1–9 weeks | Fever, chills, sweating, hemolytic anemia | Severe — potentially fatal in elderly/immunocompromised |
| Powassan Virus | As little as 15 min | 1–4 weeks | Fever, headache, encephalitis, seizures | Very Severe — 10–15% fatality, 50% long-term neurological effects |
| RMSF | 2–10 hours | 2–14 days | Fever, rash on wrists/ankles spreading to trunk | Severe — fatal without early treatment |
Symptom Timeline Matcher
This tool helps you communicate relevant information to your doctor after a tick bite. It is not a diagnostic tool — always consult a physician after a tick attachment.
Symptom Timeline Matcher
Symptoms present (check all that apply):
A Special Note on Powassan Virus
Powassan virus deserves special attention because it breaks the rules that most people apply to tick risk management. Unlike Lyme disease, which requires 36 to 48 hours of tick attachment for transmission to occur, Powassan virus can be transmitted in as little as 15 minutes of attachment. This means the guidance to "do daily tick checks and remove promptly" — while still important — is not fully protective against Powassan.
Westchester County has documented Powassan virus cases. The case fatality rate is 10 to 15%, and approximately half of survivors experience long-term neurological effects including memory problems, recurring headaches, and muscle weakness.
The only fully reliable prevention is reducing tick exposure at the source — treating your yard with our LymeShield program to suppress tick populations, combined with personal protection measures when in wooded or brushy areas.
Written by
Michael Corsetti
Board-Certified Entomologist
Cornell-educated entomologist with 20+ years in urban pest management.