I was wanting to get some apple snails, but was concerned after hearing that they can transmit rat lungworm to humans. Should this be a worry or is it very unlikely? I would happily stick my hand in a fish tank or pond, which could probably just be as risky.. not sure. Also something to note is I do wash my hands every time after doing things with the fish tank, just want some reassurance or some advice whether it's a real issue and something to stop me from getting the snails I wanted. Thanks.