Fig. 1From: Heterogeneity in the in vitro susceptibility of Loa loa microfilariae to drugs commonly used in parasitological infectionsPhotomicrograph (×400) of stained and unstained L. loa microfilariae after incubation with MTT reagent. This micrograph shows a live L. loa mf that metabolized MTT into blue formazan (left arrow) and a dead mf that is unstained (right arrow)Back to article page