Specifications include, but are not limited to:. The County of Orange (County) Health Care Agency (HCA) is seeking applications from qualified organizations to provide Sexually Transmitted Disease (STD) Testing Services. The primary goals of this program include: • STD testing of individuals at high risk for infection, specifically individuals who are homeless or at risk of homelessness and individuals with substance use issues; • Linkage of individuals to appropriate prevention and treatment services; and • Reduction of STD infection rates in Orange County.. The County of Orange (County) Health Care Agency (HCA) is seeking applications from qualified organizations to provide Sexually Transmitted Disease (STD) Testing Services. The primary goals of this program include: • STD testing of individuals at high risk for infection, specifically individuals who are homeless or at risk of homelessness and individuals with substance use issues; • Linkage of individuals to appropriate prevention and treatment services; and • Reduction of STD infection rates in Orange County.