AbstractsBiology & Animal Science

Helminthiasis is widespread and has involved a medical and veterinary problem since ancient times. Stoll (1947) has estimated that at least eight hundred million human beings are infested with more than two billion helminths. There are also thousands of species of parasites which do not infest man, but which have as their natural hosts other animals, or plants. Despite the extensive distribution of parasitic worms and their enormous economic and medical importance, little is known concerning their life processes.