Herpers know that the conditions mass-bred rodents are exposed to can contribute to problems along the line: reptiles and amphibians that consume diseased feeder rodents can acquire a whole host of organisms and following that logic, any other animals exposed to them can also acquire those organisms.

MiceOnIce.com needn’t worry about providing those conditions because they ‘humanely euthanize’ with CO₂ then freeze the rodents to kill off any pests s/he may be carrying.

miceonice.com/faq.html

Note: The AVMA lists CO₂ as an “acceptable agent and method of euthanasia“…if done properly.