Table 1.

Pairwise co-culture effort and number of positives (hypnozygote production).

Groups	Isolate pairs tested	Positives
I, I	214	68 (31.8%)
III, III	114	55 (48.2%)
IV, IV	5	1
I, II	35	1 (2.9%)
I, III	367	86 (23.4%)
I, IV	22	2
I, V	28	2
I, A. affine	28	1
I, A. tropicale	13	2
II, IV	14	0
III, IV	50	5 (10.0%)
III, V	1	0
III, A. affine	1	0
IV, V	2	1
IV, A. affine	1	0
IV, A. tropicale	1	0

Three of seven possible same-group combinations (I, III and IV) and 13 of 21 possible out-group combinations were tested. Positive ratios are reported in parentheses for group combinations that were tested using more than five unique pairs of isolates.