Plaisier, A.P.

control model treatment vector control vector onchocerciasi recrudescence ivermectin parasite effect village transmission lifespan person infection population number period ivermectin treatment result parameter onchosim distribution level value month strategy simulation duration survey remme chapter onchocerciasis control programme disease count adult assumption skin-snip reduction estimate blindness trend volvulu study plaisier prediction west africa probability programme larviciding dynamic mf production exposure impact microfilarial analysis prevalence africa production program health variation development quantification table section river coverage larvae habbema density trial 14 years cohort round fecundity tiercoura plaisier ap factor figure