TABLE 1.

S. mutans strains used in this study

Strain	No. of isolates by indicated serotype				Total no. of isolates	Yr(s) of isolation	No. from indicated source type		Origin	Description (reference or source)
	c	e	f	k			Oral	Blood
UA159	1	0	0	0	1	1980s	1	0	United States	Reference strain (1)
MT8148	1	0	0	0	1	1980s	1	0	Japan	Reference strain (25)
MT4000 series	10	10	3	0	23	1982-1990	23	0	Japan	Clinical isolates from children (this study)
NN2000 series	8	8	7	5	28	2002	28	0	Japan	Clinical isolates from 25 children and 3 adults (20)
LJ series	16	10	3	1	30	2006	30	0	Japan	Clinical isolates from 18 children and 6 mother-child pairs (this study)a
TW series	0	1	1	2	4	1990-1993	0	4	Japan	Clinical isolates from 1 bacteremia patient and 3 IE patientsb (5)
V1/P1	2	0	0	0	2	2005	1	1	Japan	Clinical isolates from IE patientsb (23)
OR22P1	0	0	0	1	1	2005	1	0	Japan	Clinical isolate from an aortic aneurysm patient (this study)
SA series	5	2	2	3	12	1990s	5	7	Finland	Clinical isolates from 5 children and 7 IE patientsb (this study)

^aClinical isolates LJ3 and LJ4, LJ11 and LJ12, LJ16 and LJ17, LJ24 and LJ25, LJ26 and LJ27, and LJ30 and LJ31 were from mother-child pairs.

^bIE, infective endocarditis.