How can i prevent itchy roundworm?

Roundworm: If you mean toxocariasis, the main prevention is not eating dirt contaminated with the organism's eggs. You can get it accidentally if gardening or playing in dirt that contains dog or cat feces. Hand-washing after such activities is key, especially before handling food! dispose of feces safely. Keep pets de-wormed. Don't eat undercooked or raw meat. http://tinyurl.com/kt8wyvj.