I started freezing all incoming sticks a couple of years ago. Anything that comes into the house gets vacuum packed and a 3 day sub zero holiday, two days in the fridge and 4 (minimum)weeks in a seperate humidor before going into the general population.
I don't know if this helps, but I've not yet had an outbreak and no one has ever complained about sticks I've given to them. So if nothing else, it makes me feel better. lol