Ehrlichia muris in Ixodes cookei Ticks, Northeastern United States, 2016–2017

Abstract

Ehrlichia muris is an agent of human ehrlichiosis. To determine its geographic spread in the United States, during 2016–2017, we tested 8,760 ticks from 45 states. A distinct clade of E. muris found in 3 Ixodes cookei ticks from the northeastern United States suggests transmission by these ticks in this region.

Keywords

• ticks
• Ixodes cookei
• Ehrlichia muris
• Ixodes scapularis
• bacteria
• United States