What ever floats your boat, I would have boiled it if possible it would defeat the purpose of buying it wet if you were to dry it out to kill any bacteria.
Interesting that diseases are of such possibility from a store. Drying the wood kills all the life in/on it, so it takes a while for it to function again as filtration.
You can also let it soak in a strong salt water solution, or a chlorine solution, (make sure you rinse it ver well with dechlorinated water before adding to tank), that will kill most nasties and snails, clean it with a pressure cleaner.