Since its inception in 2008, PHO has grown through new funding to establish the agency, as well as a series of program transfers from the Government of Ontario, including ID surveillance. PHO’s current role in ID surveillance in Ontario is to support the public health and health care systems with surveillance information, tools, and resources for the prevention and control of IDs. PHO also provides scientific and technical expertise for IDs, including different aspects of surveillance (e.g., data entry requirements, statistical algorithms, provincial surveillance reports).