Abstract
SUMMARY: An instrument for measuring the motility of larval and adult nematodes is described along with an analysis of its use as a tool to analyse drug action on these parasites. Motility was detected from larval parasites ofNippostrongylus brasiliensisandAscaris suumin the absence and presence of various anti-nematodal drugs. These agents produced, within 48 h, a significant decrease in larval parasite motility. The instrument was also capable of detecting the motility ofCaenorhabditis elegans, adult femaleBrugia pahangiand their response to anti-nematodal drugs. The design of the instrument allows us to accurately measure motility in a single sample within 60 sec.