Presumptive negative for Legionella pneumophila serogroup 1 antigen in urine, suggesting no recent or current infection. Infection with Legionella cannot be ruled out because:
-Other serogroups (other than serogroup 1, which is detected by this assay) and other Legionella species (other than Legionella pneumophila) can cause disease
-Antigen may not be present in urine in early infection
-The level of antigen may be below the detection limit of the test