The parasites you are talking about are there all year long. If you will talk to your butcher guy, he'll tell you that he will let that deer hang in the cooler for atleast 48-72 hours. That takes care of all that. He will let the hide stay on the animal during this time and the parasite will go to the hide. This is always done, if your butcher is worth his salt he'll let'em hang for a little. This has been told to me from numerous butchers and advised.