Since 1991 El Rio has provided primary medical services to thousands of individuals living with HIV/ AIDS in Pima County and Southern Arizona. Special Immunology Associates (SIA) is licensed to provide medical and behavioral health outpatient services. The clinic currently provides services to over 1200 persons living with HIV/AIDS and advocates on behalf of its patients to improve the quality of services available in Southern Arizona. Special Immunology Associates (SIA) is funded in part by the US Department of Health Resources & Services Administration Ryan White HIV Program Parts B & C and the Substance Abuse and Mental Health Services Administration (SAMHSA). Funding supports comprehensive care through a number of services and programs.