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Table 3 ELISA and IFAT results for first-time travellers (A) and frequent travellers or malaria area residents (B)

From: A new ELISA kit which uses a combination of Plasmodium falciparum extract and recombinant Plasmodium vivax antigens as an alternative to IFAT for detection of malaria antibodies

A   ELISA malaria antibody Test
   Positive Equivocal Negative Total
IFAT Positive 20 1 0 21
  Equivocal 1 0 1 2
  Negative 3 0 6 9
  Total 24 1 7 32
IFAT and ELISA clinical sensitivities are respectively 65.6% (21/32) (CI: 45.3 – 85.9%) and 75% (24/32) (CI: 57.7 – 92.3%), equivocal results considered as negative for calculation.
B   ELISA malaria antibody test
   Positive Equivocal Negative Total
IFAT Positive 37 2 0 39
  Equivocal 2 0 2 4
  Negative 1 0 0 1
  Total 40 2 2 44
IFAT and ELISA clinical sensitivities are respectively 88.6% (39/44) (CI: 78.7 – 98.6%) and 90.9% (40/44) (CI/82 – 99.8%), equivocal results considered as negative for calculation.