[A group of African students parasitized with Mansonella perstans in Cuba (a non-endemic area) from 1979 to 1982].

Sixty cases of Manzonella perstans were studied during a three year period by clinical and blood parasitologic studies. It was observed that 31.2 was negative and that mean microfilaremia decreased from 49.3, at the beginning of the study, to 32.9 at the end of it, in those cases yet positive. According to the persistent microfilaremia, which means a relative longevity of adult parasites, the surveillance of individuals suffering it is recommended at their arrival to a non-endemic area where the vectors of such disease are present.