Loiasis and diurnal microfilaremia: Searching at the right moment.

A healthy young woman from Cameroon was addressed to the tropical medicine consultation of the University Hospitals of Geneva to investigate an asymptomatic eosinophilia of 1.22 G/l and a history of "eye worms"during childhood. Direct microscopic observation found viable microfilariae and the stained blood smear confirmed Loa loa species.