Intestinal worms


Geographical distribution

Soil-transmitted helminth infections are widely distributed in tropical and subtropical areas and, since they are linked to a lack of sanitation, occur wherever there is poverty.

Latest estimates indicate that more than 880 million children are in need of treatment for these parasites.

Helminths larvae is transmitted through contaminated soil in areas where sanitation is poor. ©Jurgen

WHO’s control interventions are based on the periodic administration of anthelminthics to groups of people at risk, supported by the need for improvement in sanitation and health education.

WHO recommends annual treatment in areas where prevalence rate of soil-transmitted helminthiases is between 20% and 50%, and, a bi-annual treatment in areas with prevalence rates of over 50%.