TABLE 3.

Serotypes (PorB) of NMSB strains isolated during laboratory-based active surveillance of sporadic cases of meningococcal disease in geographically diverse regions^a

Serotype (PorB)	United States		Oregon
	No. of strains	% of strains	No. of strains	% of strains
4,7	67	27.5	36	18.0
15	39	16.0	138	69.0
14	21	8.6	5	2.5
10	15	6.1	2	1.0
1	12	4.9	2	1.0
2a	9	3.7
7	6	2.5	3	1.5
17	3	1.2	1	0.5
21	2	0.8
2b	2	0.8
2c	2	0.8
4,14	1	0.4
4,21	1	0.4
17,7	1	0.4
NSb	63	25.8	13	6.5
Total	244	99.9	200	100

^aRegions included states of the United States (California, Connecticut, Georgia, Maryland, Minnesota, Missouri, Oklahoma, and Tennessee) where isolates were collected between 1992 and 1998 and Oregon, where there is an ongoing outbreak. 

^bNS, nonserotypeable.