Table 2.

Distribution of Titers and Incident Versus Prevalent Episodes of Positive Rapid Plasma Reagin

	Lusaka, Zambia: 1290 Episodes, No. (%)	Kigali, Rwanda: 520 Episodes, No. (%)	Total: 1810 Episodes, No. (%)
Rapid plasma reagin titer
Undiluted serum	472 (36.6)	132 (25.4)	604 (33.4)
1:2	297 (23)	126 (24.2)	423 (23.4)
1:4	224 (17.4)	78 (15)	302 (16.7)
1:8	136 (10.5)	65 (12.5)	201 (11.1)
1:16	79 (6.1)	41 (7.9)	120 (6.6)
1:32	34 (2.6)	33 (6.4)	67 (3.7)
1:64	30 (2.3)	24 (4.6)	54 (3)
1:128	14 (1.1)	15 (2.9)	29 (1.6)
≥1:256	4 (0.3)	6 (1.2)	10 (0.6)
Stage
Incident	732 (56.7)	164 (31.5)	896 (49.5)
Prevalent	558 (43.3)	356 (68.5)	914 (50.5)