More than 350 cases of Lyme disease, Delaware’s most common tick-borne disease, were reported in 2025, reinforcing why tick prevention matters across the state.

More than 200 cases of alpha-gal syndrome have been reported in Delaware since it became reportable in 2024, making tick prevention more important for residents and visitors.

Powassan virus can spread through the bite of an infected tick, and research suggests transmission may happen quickly. Symptoms may not appear for 1 to 5 weeks.