The injection drug use (IDU) has been the most common mode of the transmission of this disease. In total, it accounts for 47.6 percent of the total transmissions that occur (Wenger, 1999). However, this has changed overtime. Heterosexual contact has become the most common mode of transmission for women.

It accounted for 36.1 percent of all cases in 2001 (Wenger, 1999).These trends are consistent in most of the racial and ethnic groups. The major route of transmission is still under investigation.  This cases that are still under investigation will keep on being classified in that manner until the researches done show otherwise.

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