I wouldnt feed any feeder that has any type of parasite... A feeder is very cheap compared to a vet bill... Why risk it? So what if "it doesnt transfer to reptiles" Im no expert and i dont suspect many of the people around here can properly identify a parasite on a mouse and tell you this wont affect the snake... Why risk it? Parasite's are a no no in my house and I buy good feeders, and Ive had healthy snakes...