Meets laboratory confirmation criteria: indicate if the case meets the laboratory criteria (see below). If not, select the No option. If not known or unavailable then select the Unknown option.

Laboratory definitive evidence for a confirmed case requires at least one of the following:

• isolation (culture) of Legionella species from respiratory secretions or other clinical samples
• detection of Legionella species nucleic acid (by PCR or other detection method)
• a fourfold or greater rise in IFA titre against Legionella species to ≥ 256 between paired sera tested in parallel using pooled antigen at the same reference laboratory
• detection of Legionella species antigen in urine.

Laboratory suggestive evidence for a probable case requires:

• one or more elevated Legionella species serology titres of ≥ 512 tested using pooled antigen at a reference laboratory.

Laboratory results: indicate the result of each laboratory confirmation method (including laboratory suggestive evidence for probable cases). If the laboratory test results were positive select the Yes option, if negative select the No option. If the results of the laboratory test are not yet available, select Awaiting results. If any of the laboratory tests were not carried out, select Not Done.