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. 2007 Feb 21;6:19. doi: 10.1186/1475-2875-6-19

Table 4.

ELISA and IFAT results for not-exposed-to-malaria blood donors

ELISA malaria antibody test

Positive Equivocal Negative Total
IFAT Positive 0 0 4 4
Equivocal 0 0 3 3
Negative 6 1 2138 2145
Total 6 1 2145 2152

IFAT and ELISA clinical specificities: 99.6% (2145/2152) (CI: 99.4 – 99.9%), equivocal results considered as positive for calculation.