Rapid Test Reaction Matrix. Left: Reactivity of various species of pLDH in the enzyme capture assay is shown for comparison. Right: The antibodies indicated in the Y-axis were conjugated to colloidal gold under standard conditions and used to test for reactivity with recombinant pLDH of P.falciparum, P. vivax, P. malariae, and P. ovale. Each enzyme conjugate was used with a test strip containing the indicated antibodies (X-axis) immobilized on the test strip. Line intensity of each reaction was color coded as a function of its intensity according the scheme indicated in the inset legend. The pLDH enzyme solution mimicked a sample of 1% parasitaemia.