Table 3.

Features of selected VNTR loci observed in 100 N. meningitidis isolates.

Locus	Length of repeat unit (bp)	Size range of amplicon (bp)	Range of repeat unita	Number of allelesa	Polymorphism indexb
NMTR1	7	197–589	3–59	40	0.96
NMTR2	7	236–446	4–34	23	0.92
NMTR6	21	165–228	2–5	4	0.73
NMTR7	4	195–291	3–27	18	0.9
NMTR9	9	189–513	3–39	28	0.94
NMTR9a	30	188–278	1–4	4	0.6
NMTR9b	18	182–218	1–3	3	0.33
NMTR9c	15	187–217	2–4	3	0.35
NMTR10	6	221–395	4–33	12	0.71
NMTR12	13, 12	218–572	3–31	19	0.81
NMTR18	9	182–227	2–7	6	0.67
NMTR19	13	186–251	2–7	6	0.64

^aNot including the unamplifiable allele at NMTR1 and NMTR12.

^bNei's diversity index (DI) = 1 - ∑ (allele frequency)²