Table 1. Diagnostic criteria used for patient enrolment.

	Serology	Parasitology	PCR	Combination of Serology/parasitology /PCR	Not specified	Overall
Number of studies	55	2	2	42	8	109
Number of positive test results required
1	0 (0%)	0 (0%)	2 (100%)	3 (7.1%)	0 (0%)	5 (4.6%)
2	38 (69.1%)	0 (0%)	0 (0%)	22 (52.4%)	0 (0%)	60 (55.0%)
3	8 (14.5%)	0 (0%)	0 (0%)	6 (14.3%)	0 (0%)	14 (12.8%)
4	0 (0%)	0 (0%)	0 (0%)	3 (7.1%)	0 (0%)	3 (2.8%)
>4	0 (0%)	0 (0%)	0 (0%)	1 (2.4%)	0 (0%)	1 (0.9%)
Not specified	9 (16.4%)	2 (100%)	0 (0%)	7 (16.7%)	8 (100%)	26 (23.9%)

Percentages are based on columns; PCR = polymerase chain reaction