Back to today’s briefing

Story perspectives

First U.S. Longhorned Tick Case Alarms Health Officials

5/30/2025

47 8

Summary

Story summary

Connecticut has reported the first U.S. case of the invasive longhorned tick, which carries the dangerous Ehrlichia chaffeensis bacteria, responsible for human monocytic ehrlichiosis (HME). This tick, originally from eastern Asia, poses a growing threat as it spreads across the eastern U.S., raising alarms for both human and animal health.

1 of 1

Story summary

Connecticut has reported the first U.S. case of the invasive longhorned tick, which carries the dangerous Ehrlichia chaffeensis bacteria, responsible for human monocytic ehrlichiosis (HME). This tick, originally from eastern Asia, poses a growing threat as it spreads across the eastern U.S., raising alarms for both human and animal health.