So, seven months ago I moved out of my old apartment. While there I owned both of my snakes and my roommate also had two ball pythons. This morning my old roommate told me that one of her snakes had vomited up (not regurged) his last meal and died soon afterward. She thinks an internal parasite may have been the cause because he's never vomited before. Everything seemed normal, but he's always been a picky eater. She's going to get her remaining snake tested today for parasites. I was wondering if I should also take my snakes to get tested since they lived in the same apartment seven months ago. They always were in different rooms from each other but we did use the same sink when it came to cleaning their cages. Are internal parasites that spreadable? Has enough time passed for my snakes to show no signs of sickness for me to not be worried about it?