Section 16.02.10.390 - LEGIONELLOSIS01.Reporting Requirements. Each case of legionellosis must be reported to the Department or Health District within three (3) working days of identification.02.Investigation. Each reported case of legionellosis must be investigated to confirm the diagnosis and identify possible sources of the infection. When two (2) or more cases occur within thirty (30) days of each other, an investigation must be conducted to identify a common environmental source and identify ways to prevent further infections.Idaho Admin. Code r. 16.02.10.390