Nope. Roundworm eggs will survive a very long time in the environment, not much you can do to get rid of them. Every time an infected bird poops they deposit thousands of microscopic worm eggs. Keep grass cut short so the sun can do it's work, try to keep things as clean and dry as you reasonably can, remove droppings as often as needed so they don't build up. To sanitize you would have to dig up, remove and replace at least the top 6 inches of your soil (with something that you knew was parasite free). And then one bird carrying roundworm poops in your run, and it all starts again. Roundworm in particular is really common for reinfection. They pick it up scratching and pecking and eating things in the dirt. You just have to watch for reinfection, and treat as needed. Some can do once or twice a year and that's enough. Some have to do more. I personally have to worm my birds every three months. Every flock is different, every environment is different, even neighbors can have different loads of parasites. I'm actually working on a new coop on new ground, so I can move off the ground they've been on for years, hopefully my reinfection rate will be lower then.
hopefully one day I will have some sage advice to provide others too. I will have to check that thread out, would love to know more about chicken genes, probably would help me decide what would be best to add to my flock in a few years.
