Table 2. Legionella pneumophila species PCR results from environmental samples collected on merchant vessel, Australia, 2015.

Sample type	Samples collected on vessel, by date												Dismantled showerheads
	August 27			September 4			October 12
	Reference laboratory testing			Reference laboratory testing			In-field testing			Reference laboratory testing			Reference laboratory testing
	Total	PCR+		Total	PCR+		Total	PCR+		Total	PCR+		Total	PCR+
Cabin shower heads	6	3		36	0		12	0		29	0		32	19
Cabin faucets	14	9		33	1		12	0		29	1		NA	NA
Air conditioning	4	0		NA	NA		NA	NA		NA	NA		NA	NA
Water supply	2	0		NA	NA		NA	NA		NA	NA		NA	NA
Others	1	1		10	1		NA	NA		NA	NA		NA	NA
Total results	27	13		79	2		24	0		58	1		32	19
PCR controls
Positive, Legionella DNA extract	2	2		2	2		2	2		2	2		2	2
Negative, ultrapure water	6	0		16	0		5	0		12	0		6	0
*NA, not applicable; +, positive.