Table 1. General characteristics of studied population and serological results.

Ethnicity	Sex	n	Age		Serology
			Range	Mean/Sd	Pos 1∶80	%	Neg
Bantus Center	M	240	16–87	53.4/13.8	91	37.9	149
	F	226			95	42.0	131
Total Center		466	16–87	53.4/13.8	186	39.9	280
Pygmies South	M	150	2–82	29,3/17.3	31	20.7	119
	F	154			35	22.7	119
Bantus South	M	201	4–82	30/23.1	85	42.3	116
	F	213			89	41.8	124
Total South		718	2–82	29.7/20.8	240	33.4	478
Pygmies East	M	267	8–83	39.2/17.3	95	35.6	172
	F	216			56	25.9	160
Bantus East	M	238	2–87	39.5/18.9	111	46.6	127
	F	158			80	50.6	78
Total East		879	2–87	39.3/18	342	38.9	537

Pos: Positive, Neg: Negative, Sd: Standard deviation.