HIV is often diagnosed in conjunction with another infection. Hep C is a common co-infection. More information can be found at www.hepcinfo.ca.
These documents spoke to co-infection with HIV:
Centre for Disease Control (CDC). (November 2005). Coinfection with HIV and Hepatitis C Virus. Retrieved August 27, 2008 from http://www.cdc.gov/hiv/resources/Factsheets/PDF/coinfection.pdf.
Centre for Disease Control (CDC). (January 2008). TB and HIV/AIDS. Retrieved August 27, 2008 from http://www.cdc.gov/hiv/resources/factsheets/PDF/hivtb.pdf.