TABLE 3.

Species and genotypic diversities among strains by host group and body site

Host group	Body site	No. of samples	Species diversitya	Genotypic diversityb
HIV+, NP	Oral cavity	12	0.292	12
	Vagina	8	0.375	8
	Rectum	12	0.292	12
	All combined	32	0.323	24.381
HIV−, NP	Oral cavity	11	0.165	11
	Vagina	10	0.580	10
	Rectum	8	0.656	8
	All combined	29	0.497	20.512
HIV−, P	Oral cavity	6	0	6
	Vagina	8	0.531	8
	Rectum	5	0.640	5
	All combined	19	0.476	17.190

^aSpecies diversity is calculated as 1 − Σp_s², where p_s represents the frequency of a particular species (19). The species diversity ranges from a minimum of 0, when all isolates are of the same species, to a maximum of 1, when every isolate is a different species. 

^bGenotypic diversity is calculated as 1/Σp_g², where p_g represents the frequency of a unique genotype (29, 30). Genotypic diversity has a minimum value of 1 and a maximum value of N, where N is the sample size.