Extraordinary occurrence of illness.

1. The health authority shall investigate each report of a case having an extraordinary occurrence of illness or suspected case considered to have an extraordinary occurrence of illness to confirm the diagnosis, to determine the extent of any outbreak, to identify the source of infection or illness, to determine if there is a risk to the health or welfare of the public and to determine if management by a public health agency is feasible. 2. The health authority shall carry out the investigation and measures for the prevention and control of the extraordinary occurrence of illness in consultation with the Chief Medical Officer. The Chief Medical Officer may investigate an extraordinary occurrence of illness by conducting a special study. 3. The health authority shall notify the Chief Medical Officer if the source of infection or illness is known or suspected to be related to an act of intentional transmission or biological terrorism.