@rundocuri- Not only are roundworm infection uncomfortable, but the treatments to cure them can cause uncomfortable side effects as well. This is why prevention is the best plan of action.
People should never drink water that may not be clean. This includes water that may be dirty such as water from outdoor sources. Never drink water that you are not sure of the cleanliness of its source.
People who handle animals are also greater risks for developing roundworm infections. They should wash their hands frequently, and never touch and eat food while working with animals.