Table 3. Geographical distribution, characteristics, and vaccination history of 27 carriers of Corynebacterium diphtheriae, Vietnam*.

Patient no.	District	Commune	Village	HH ID no.	Age, y/sex	tox gene	Biovar	Elek test result	Vaccine status, no. doses	DTP3 coverage, % (95% CI)
1	Tay Tra	Tra Phong	Tra Nga	305	25/M	‒	gravis	‒	NA	60 (35‒81)
2		Tra Thanh	Thon Mon	818	23/M	‒	NA	NA	NA	76 (1‒91)
3†		Tra Lanh	Tra Luong	1003	40/F	‒	mitis	‒	NA	64 (34‒86)
4		Tra Xinh	Tra Kem	1401	5/F	‒	NA	NA	4	85 (55‒96)
5				1404	2/F	‒	NA	NA	4
6				1407	4/F	‒	NA	NA	4
7			Tra Veo	1501	3/F	‒	mitis	‒	4	63 (38‒82)
8					5/F	‒	mitis	‒	4
9				1505	2/F	+	mitis	‒	4
10	Son Ha	Son Ha	Deo Ron	1607	10/F	+	NA	NA	0	71 (44‒89)
11					3/F	‒	mitis	‒	3
12					2/F	+	NA	NA	4
13			Dong Reng	1704	9/M	‒	NA	NA	0	40 (19‒65)
14				1707	14/M	+	mitis	+	NA
15			Ha Bac	1807	9/M	+	NA	NA	0	71 (46‒87)
16				1811	7/F	+	mitis	+	4
17					10/M	+	mitis	‒	3
18				1812	10/M	+	mitis	‒	3
19					4/M	‒	mitis	‒	0
20		Son Giang	Lang Ri	2314	10/F	‒	mitis	‒	0	94 (68‒99)
21			Ta Dinh	2406	28/M	‒	gravis	‒	NA	93 (63‒99)
22					25/F	+	gravis	+	NA
23				2409	3/M	‒	gravis	‒	4
24		Son Ky	Lang Re	2505	7/F	‒	NA	NA	4	88 (61‒97)
25		Son Hai	Lang Trang	3004	7/F	‒	gravis	‒	3	80 (57‒92)
26				3011	2/F	‒	NA	NA	3
27				3012	5/F	‒	gravis	‒	3

*DTP3 coverage was the coverage at the village level where carriers were living. DTP, diphtheria‒tetanus‒pertussis; HH, household; ID, identification; NA, not available; ‒, negative; +, positive. †For patient 3, C.diphtheriae was identified from a nasopharyngeal swab specimen and a throat swab specimen. Others were identified only from nasopharyngeal swab specimens.