Under investigation - a case which has been notified but information is not yet available to classify it as probable or confirmed.

Probable - a clinically compatible illness that has laboratory suggestive evidence.

Confirmed - a clinically compatible illness that has laboratory definitive evidence.

Not a case - a case that has been investigated and subsequently found not to meet the case definition.

For more information refer to the Legionellosis section of the Communicable Disease Control Manual.