The page below is a sample from the LabCE course Tickborne Diseases. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Tickborne Diseases (online CE course) »
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 97 CE courses, most popular
$95 Add to cart
Pick Your Courses
Up to 8 CE hours
$50 Add to cart
Individual course$20 Add to cart

Amblyomma americanum map/CDC

Reported cases ehrlichiosis in US 2013/CDC

Ehrlichiosis: Epidemiology

Ehrlichiosis is caused by at least three different ehrlicial species in the United States: Ehrlichia chaffeensis, E. ewingii, and a species provisionally called Ehrlichia muris-like (EML). E. chaffeensis and E. ewingii are difficult to distinguish serologically, but may be distinguished if they are cultured or specific molecular testing is performed. E. ewingii is found in granulocytes.
Ehrlichia are intracellular bacterial parasites that form microcolonies in the cytoplasm of white blood cells (WBCs) called morulae. The disease caused by E. chaffeensis is called human monocytotropic ehrlichiosis. It is mostly seen in the Southeastern and South Central United States. 35% of cases are acquired in Oklahoma, Arkansas, and Missouri. About a thousand cases were reported to the CDC in 2014.
Ehrlichiosis is transmitted by the Amblyomma americanum (Lone Star) tick.