TABLE 1.

Distribution of PFGE patterns and groups in relation to capsular types and origins of S. suis strains

Parameter	na	Value for group
		S. suis isolates			Capsular type						Origin
		Virulentb	Nonvirulentc	Otherd	2	1/2	3	7	9	AUTe	Human	Pig
No. of isolates	123	90	30	3	77	13	7	14	10	2	26	97
No. of PFGE patterns	74	55	23	3	39	9	6	14	8	2	13	66
No. in PFGE groupf
A
a	2	1	1	0	1	1	0	0	0	0	0	2
b	40	25	14	1	22	6	2	7	1	2	5	35
c	10	5	5	0	5	3	0	2	0	0	0	10
B
d	26	23	2	1	15	2	0	1	8	0	5	21
e	35	29	5	1	28	0	5	1	1	0	14	21
f	2	1	1	0	0	1	0	1	0	0	0	2
C
g	6	6	0	0	6	0	0	0	0	0	2	4
h	2	0	2	0	0	0	0	2	0	0	0	2

^an, total no.

^bS. suis strains isolated from meningitis, arthritis, and septicemia in pigs and humans were classified as virulent strains.

^cStrains isolated from palatine tonsils and nasal cavities of clinically healthy pigs were classified as avirulent strains.

^dIsolation of three strains was not done.

^eAUT, autoagglutinable strains of S. suis.

^fThe 123 isolates of S. suis diverged, and at 60% homology, three PFGE groups, A, B, and C, were identified, and at 69% homology, eight subgroups, a to h, were observed.