Historically, they were initially compared to various groups of parasitic worms.

Freshwater fish are a second intermediate host for the parasitic worm.

The chemical was tested for its ability to kill nematodes, a type of parasitic worm.

Those that live inside the host are called endoparasites (including all parasitic worms).

It's a parasitic worm with a long incubation period - three or more years.

However, results varied among the different species of parasitic worms.

They carry over 100 pathogens and transmit some parasitic worms.

He also followed the lives of 27,542 wasps, and about 650,000 parasitic worms.

From an early age he was devoted to helminthology (the study of parasitic worms).

Populations in the developing world are at particular risk for infestation with parasitic worms.