Why People dont get Sick On SHIPS Description Why People don't get Sick On SHIPS

Why People don't get Sick On SHIPS? - it's a fact that if a crew is living on board for a certain period of time on ship together, they stop getting Sick, but why? that's a question that you people have been asking for quite Some time now and today I wish to answer this question and elaborate it once and for all. I will explain this phenomenon of not getting Sick in detail. Why People don't get Sick On SHIPS?