Table 3. Reported culture-confirmed cases of Legionnaires’ disease and Legionella pneumophila isolates by species and serogroup, European Union/European Economic Area, 2011–2015 (n=3,645).

Species	Serogroups	Culture-confirmed cases
		No.	%
Legionella pneumophila	serogroup 1	3,020	82.9
	serogroup 2	19	0.5
	serogroup 3	101	2.8
	serogroup 4	13	0.4
	serogroup 5	19	0.5
	serogroup 6	42	1.2
	serogroup 7	9	0.2
	serogroup 8	8	0.2
	serogroup 9	5	0.1
	serogroup 10	19	0.5
	serogroup 11	3	0.1
	serogroup 12	1	< 0.1
	serogroup 13	2	0.1
	serogroup 14	7	0.2
	serogroup mixed	4	0.1
	non-serogroup 1	7	0.2
	serogroup unknown	232	6.4
L. anisa	NA	2	0.1
L. bozemanii	NA	15	0.4
L. cincinnatiensis	NA	1	< 0.1
L. dumoffii	NA	2	0.1
L. longbeachae	NA	35	1.0
L. macaechernii	NA	1	< 0.1
L. micdadei	NA	12	0.3
L. sainthelensi	NA	1	0.0
L. other species	NA	27	0.7
L. species unknown	NA	38	1.0
Total	NA	3,645	100

This study excluded Croatia from the analysis, because it only started reporting on Legionnaires’ disease in 2013.