Table 3.

Test performance of binding to the produced antibodies immobilized in SPR system in comparison to conventional ulcer secretion cultures

SPR/culture	False positive (SPR)	True positive (culture)	False negative (SPR)	True negative (culture)	Total
Staphylococcus aureus	0	7	1	16	24
Enterococcus fecalis	2	1	0	21	24

Sensitivity for Staphylococcus aureus was 87.5 %, specificity 100 %, PPV 100 % and NPV 94 %. Sensitivity for Enterococcus fecalis was 100 %, specificity 91.3 %, PPV 33.3 % and NPV 100 %