Table 2.

Average annual rates (per 100,000 individuals) of meningococcal disease in the US (1997–2001)

Age (years)	Group B	Group C	Group Y	Other	All Groups
<1	5.1	1.0	2.3	1.1	9.6
1	1.4	0.8	0.7	0.5	3.4
2–4	1.1	0.7	0.2	0.3	2.3
5–17	0.3	0.4	0.3	0.2	1.1
18–34	0.3	0.2	0.2	0.1	0.8
35–49	0.1	0.1	0.1	0.1	0.4
50–64	0.1	0.1	0.2	0.1	0.5
≥65	0.2	0.2	0.6	0.2	1.2
All Ages	0.3	0.2	0.3	0.1	1.0