Ehrlichiosis 2003

Table 1. Ehrlichiosis Cases by Race and Sex, Indiana, 2003

  2003 1999-2003
Cases Rate* Cases
Total 10 0.20 23
Race
   White 9 0.20 21
   Black 0 0 0
   Other 0 0 0
   Not Reported 1 - 2
Sex
   Male 5 0.20 13
   Female 5 0.20 10

*Rate per 100,000 population based on the U.S. Census Bureau’s population data as of July 1, 2003

Human Monocytic Ehrlichiosis (HME) is caused by the bacteria Ehrlichia chaffeensis and is transmitted to humans by the lone star tick, Amblyomma americanum. Human Granulocytic Ehrlichiosis (HGE) is caused by the bacteria Anaplasma phagocytophilum and is transmitted to humans by the deer tick, Ixodes scapularis.

From 1999-2003, 23 cases of ehrlichiosis were reported in Indiana: 21 cases of HME and 2 cases of HGE. Ten cases of ehrlichiosis were reported in 2003. Figure 1 shows the number of reported cases by year for 1999-2003.

All cases of HME occurred in residents of Southwestern Indiana counties, where the lone star tick is most prevalent. The female to male ratio for 1999-2003 was 1:1. All cases for which race was reported were white.

You can learn more about ehrlichiosis by visiting the following Web site:
http://www.cdc.gov/ncidod/dvrd/ehrlichia/Index.htm.