| simulium exiguum, the vector of onchocerca volvulus on the rio micay, colombia. | simulium exiguum were collected in the san antonio area on the rio micay as they blood-fed on a volunteer naturally infected with onchocerca volvulus. the daily dissection of specimens revealed that delayed larval development was common and 23% of the larvae were abnormally formed. however, third-stage larvae were recovered by late day 5 (140 hours) following engorgement. it is concluded that s. exiguum is the vector of o. volvulus at this colombian endemic focus even though its host efficiency ... | 1980 | 7386717 |