Table 1. Diphtheria cases by species, clinical presentation and age group, United Kingdom, 2009–2017 (n = 43).

	< 16	16–24	25–44	45–64	≥ 65	Total
Toxigenic Corynebacterium diphtheriae	5	2	4	4	3	18
Cutaneous	3	1	4	4	2	14
Respiratory (no membrane)	1	0	0	0	1	2
Respiratory (no membrane)/cutaneous	0	1	0	0	0	1
Respiratory (with membrane)	1	0	0	0	0	1
Toxigenic Corynebacterium ulcerans	3	2	1	6	3	15
Cutaneous	0	0	0	4	1	5
Other/unspecified	1	0	0	0	1	2
Respiratory (no membrane)	2	2	1	1	0	6
Respiratory (with membrane)	0	0	0	0	1a	1
Respiratory (with membrane)/cutaneous	0	0	0	1a	0	1
Total toxigenic cases	8	4	5	10	6	33
Corynebacterium diphtheriae NTTB	0	3	7	0	0	10
Asymptomatic	0	1	2	0	0	3
Cutaneous	0	1	3	0	0	4
Respiratory (no membrane)	0	1	2	0	0	3

^a Fatality.