The merthiolate-iodine-formalin (MIF) technique to detect human intestinal parasites in feces was inefficient for the detection of hookworm and Trichuris trichiura eggs. Addition of a saturated-brine flotation step increased recovery of hookworm eggs by 77% and Trichuris trichiura eggs by 87%. Recovery of Ascaris lumbricoides also was increased by 71%. This was a significant improvement in the sensitivity of the MIF technique for these 3 kinds of human parasite.

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