Section 16.02.10.260 - EXTRAORDINARY OCCURRENCE OF ILLNESS, INCLUDING CLUSTERS01.Reporting Requirements. Cases, suspected cases, and clusters of extraordinary or unusual illness must be reported to the Department or Health District within one (1) working day by the diagnosing person.a. Unusual outbreaks include illnesses that may be a significant risk to the public, may involve a large number of persons, or are a newly described entity.b. Even in the absence of a defined etiologic agent or toxic substance, clusters of unexplained acute illness and early-stage disease symptoms must be reported to the Department or Health District within one (1) working day and investigated.02.Investigation. Each reported case of extraordinary occurrence of illness, including clusters, must be investigated to confirm the diagnosis, determine the extent of the cluster or outbreak, identify the source of infection or exposure, and determine whether there is a risk to the public warranting intervention by a public health agency. Evaluation and control measures will be undertaken in consultation with the Department and other appropriate agencies. The Department may elect to investigate by conducting special studies as outlined in Section 070 of these rules.03.Handling of Report. The Department and the Health District will exchange reported information within one (1) working day on any reported case or suspected case.Idaho Admin. Code r. 16.02.10.260