Document Type


Publication Date




Publication Title

Clinical Microbiology and Infection


15 Supplement 2




Human monocytic ehrlichiosis (Ehrlichia chaffeensis), HME, is a tick-transmitted, rickettsial disease that has recently increased substantially in the USA from 142 reported cases in 2001 to 506 reported cases in 2005 [1,2]. There have been increasing surveys of tick populations over the past 10 years that have in turn supported the development of models for tick-borne disease transmission. Resulting HME models [3] suggest the importance of metapopulation structures, landscape environment parameters and periodic climatic effects in predicting the dynamics of HME transmission and the efficacy of control efforts, such as the reduction of the tick population through acaricide use. On this note, we describe a spatially-explicit model for HME transmission, and give a result illustrating the importance of migration in the dynamics of HME risk.


H. Gaff is supported by Grant Number K25AI067791 from the National Institute of Allergy and Infectious Diseases. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Allergy and Infectious Diseases or the National Institutes of Health.

Original Publication Citation

Gaff, H., Gross, L., & Schaefer, E. (2009). Results from a mathematical model for human Monocytic ehrlichiosis. Clinical Microbiology and Infection, 15 (Supplement 2), 15-16. doi:


0000-0002-4034-2684 (Gaff)