Table 1. Demographic data and seroprevalence among blood donors.

Case	Age/gender	Place of residence	Chimeric Trypanosoma cruzi antigens (ABBOTT PRISM Chagas assay) (RLU)	ELISA local antigen (OD)	Immunofluorescence local antigens	Result
1	32/male	Urban	0.3	0.67	Positive 1:50	Positive
2	34/female	Urban	13	0.44	Negative	Negative
3	50/male	Urban	9.29	0.83	Positive 1:50	Positive
4	57/male	Urban	0.4	0.62	Positive 1:50	Positive
5	27/male	Rural	0.4	0.60	Negative	Negative
6	21/female	Rural	9.7	0.32	Negative	Negative

Abbott PRISM Chagas chemiluminescent assay results are shown as relative light units (RLU); cut-off >1 positive; ELISA local antigen results are shown as optical density at 492nm cut-off >0.53 positive; Immunofluorescence cut-off dilution is 1:50.