QT isn't about just worrying about an "extreme virus" and in some cases no one will ever be sure if good QT could have prevented a collection loss. QT is about lessening your odds of anything coming in from a new animal. Mites can transmit disease. RI's can spread. Ticks are just plain gross. For me it just doesn't make any sense at all to risk your pet snake or all the investment in your breeding ball pythons by tossing in a snake you just bought into the mix without any QT.