Differentiating P. knowlesi. A. Recombinant Pk-LDH was used in a immunochromatographic format matrix. The pLDH enzyme solution was diluted to mimic a sample of 1% parasitaemia. B. Test strips with the indicated immobilized antibodies were reacted with Pf-LDH, Pm-LDH, Po-LDH, Pv-LDH or Pk-LDH and 6C9-conjugated gold. The pLDH enzyme mimicked a sample of 10% parasitaemia.