Most parasitic infestations are more common in tropical or subtropical areas and in rural or
Parasitic worms have plagued humans since before our earliest recorded history. Infestation is most
frequent in children and women. In pregnant women, worm infestation produces anaemia and the
risk of bearing children with low birth weight. Children who are infested suffer from stunting of
growth and impaired mental development due to poor absorption of nutrients and anaemia. This
occurs because the worms feed on the host’s tissues, especially blood, leading to the loss of iron and
This module covers the more common parasitic worm infestations, the signs and symptoms of such
infestations and their prevention and management.