Anaplasmosis

Watch↑ rising

Vector-borne

Current NYS Status

2,025 cases in 2024 — 1.7× the 5-year baseline of ~1,180. Above baseline.

2024 statewide cases: 2,025

Source: NYSDOH Annual Communicable Disease Report 2024 + 5-yr baseline

What is it?

Anaplasmosis is caused by Anaplasma phagocytophilum and transmitted by blacklegged ticks — the same ticks that spread Lyme disease. NYS had 2,025 reported cases in 2024, with the highest burden in the Hudson Valley, Capital Region, and Long Island.

How it spreads

Transmitted by the bite of infected blacklegged ticks. The tick must typically be attached for several hours before transmission can occur. Not spread person-to-person.

Symptoms

Fever, headache, muscle aches, and malaise appearing 1–2 weeks after a tick bite. Unlike Lyme, anaplasmosis does not typically cause a characteristic rash. Can be severe in elderly or immunocompromised individuals.

Who is at risk?

Anyone in tick-endemic areas. Older adults and immunocompromised individuals are at higher risk for serious illness. People who spend time outdoors in wooded or grassy areas have the highest exposure risk.

What you can do

🛡Use tick repellent and perform full-body tick checks after outdoor activities

🛡Promptly remove attached ticks with fine-tipped tweezers

⚕️See a provider if you develop fever and flu-like symptoms after a tick bite

Tier B — Annual report tracking

Based on NYSDOH annual communicable disease report. Threat level reflects 2024 case counts compared to the 5-year baseline.

Seasonality: tick season

This information is for general public health awareness and is not a substitute for professional medical advice, diagnosis, or treatment.