World health organization

Nepal: ensuring a worm-free childhood

A school boy gives his sample to a member of the study team.
WHO/H. Allen

Slide 7

After three weeks (the ideal interval to assess the curative effect of the drug and avoid positive samples due to re-infection) the team returns to the schools. Children identified as infected during the first round are re-tested in exactly the same way as before and then the difference in the number of eggs between the two rounds is compared.

© WHO. All rights reserved.