The Illinois Order for Sexually Transmissible Diseases (HIV/AIDS) is a public health measure established by the Illinois Department of Public Health (DPH). It requires specific testing, reporting, and treatment requirements for individuals living with HIV/AIDS in the state of Illinois. The Illinois Order is divided into two parts: the “mandatory” and “voluntary” portions. The “mandatory” portion requires individuals diagnosed with HIV/AIDS to undergo testing, provide informed consent, and receive medical care. The “voluntary” portion encourages individuals living with HIV/AIDS to receive counseling, testing, and treatment, and also allows for access to support services and prevention education. The Illinois Order for Sexually Transmissible Diseases (HIV/AIDS) also includes three types of orders: the “primary order”, the “secondary order”, and the “follow-up order”. The “primary order” is used when an individual is initially diagnosed with HIV/AIDS. The “secondary order” is used when an individual has not complied with the primary order, and the “follow-up order” is used when an individual has not complied with the secondary order. The Illinois Order for Sexually Transmissible Diseases (HIV/AIDS) is designed to ensure individuals living with HIV/AIDS are provided comprehensive care and support. It also helps to reduce the spread of HIV/AIDS by encouraging individuals to seek testing and treatment.