Figure 2

Leukocyte removal efficacy of NWF filter filtration coupled with 60% Percoll concentration. A P. vivax blood sample was treated by NWF filter filtration then performed 60% Percoll concentration: (A) Excessive WBC contamination in the 60% Percoll enrichment slide without removing WBC (100× oil-immersion objective), (B) With NWF filter filtration, no WBCs could be observed. (100× oil-immersion objective), (C) Even including more RBCs, still no single WBC was fund (40× high power objective), the rectangle represent the same field of (B).