TABLE 4.

Multilocus linkage disequilibrium analysis (I_A) of the 31 V. cholerae strains studied

Group (n)	No. of STs	Mean no. of alleles per locus	VEa	VOa	IA ± SD	IAS	Pb
Total isolates (31)	5	3.17	1.16	5.59	3.81 ± 0.24	0.762	<0.0001
Total STs (5)	5	3.17	1.04	2.04	0.97 ± 0.62	0.194	0.065

^aCalculated as described by Maynard-Smith et al. (27). V_E, expected variance; V_O, observed variance.

^bProbability of observing an V_O/V_E ratio as or more extreme than that found in the original data based on 10,000 Monte Carlo randomizations.