Question: are roundworms the same as threadworms?
Answer: The main culprits belong to the roundworm subgroup and include threadworm, large roundworms, whipworms and hookworms. In Australia, threadworm (or pinworm) is the most common intestinal worm. These worms hatch out of eggs swallowed by the host. But don't worry: they're relatively harmless and easily treated.