Ehrlichiosis 2002

Table 1. Ehrlichiosis Cases by Race and Sex, Indiana, 2002

  2002 1998-2002
Cases Rate* Cases
Total 2 .06 14
Race
   White 1 .02 12
   Black 0 0 0
   Other 0 0 0
   Not Reported 1   2
Sex
   Male 2 .06 9
   Female 0 0 5

*Rate per 100,000 population based on the U.S. Census Bureau’s population data as of July 1, 2002

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 1998-2002, 14 cases of ehrlichiosis were reported in Indiana: 13 cases of HME and 1 case of HGE. Two cases of ehrlichiosis were reported in 2002. Figure 1 shows the number of reported cases by year for 1998-2002.

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 1998-2002 was 1:1.8. 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