Table 1. Comparison of the clonal complex distribution of the study isolates and all English, Welsh and Northern Irish serogroup B invasive meningococcal disease isolates for the epidemiological year 2007/8.

Clonal complex	Proportion of isolates (number)
	Study (80)	2007/8 (539)
11	2.5% (2)	1.1% (6)
18	1.3% (1)	1.7% (9)
32	7.5% (6)	5.9% (32)
35	1.3% (1)	1.5% (8)
60	3.8% (3)	2.0% (11)
103	1.3% (1)	0.2% (1)
162	5.0% (4)	1.9% (10)
213	6.3% (5)	9.5% (51)
269	27.5% (22)	33.0% (178)
461	2.5% (2)	2.2% (12)
1157	3.8% (3)	0.4% (2)
41/44	26.3% (21)	31.5% (170)
UA	11.3% (9)	7.2% (39)
other	n/a	1.9% (10)

Isolates used in the study were selected to represent the diversity and distribution (in terms of clonal complex) of all English, Welsh and Northern Irish invasive MenB isolates from 2007/8. Note that a proportion of the predominant CCs (cc269 and cc41/44) were forfeited to include lesser CCs. Other variations were due to the limited availability of multilocus sequence typed isolates with accessible clinical specimens. UA =  unassigned STs. n/a =  not applicable.