Table 3.

Distribution of genes encoding surface proteins across serotypes

Serotype	No. of isolates with the following surface protein genea:				Total no. of isolates
	bca	eps	rib	alp3
Ia	12	35			47
Ib	11	1		1	13
II	7	1	2	1	11
III	2		116		118
IV	1	2			3
V		2		11	13c
NTb	1		5		6
Total	34	41	123	13	211

^aBoldface numbers indicate a significant correlation between the surface protein gene and the serotype (see the text).

^bNT, nontypeable.

^cOne isolate failed to amplify any of the surface proteins tested.