If your visiting a hot, tropical climate you run the risk of developing some form of gastrointestinal illness.  This can be caused by bacteria, viruses or parasites.  Some of the buglike culpirits are salmonella, shigella, E Coli, staphylococci, campylobacter jejuni, hepatitis A and cryptosporidiosis.  The biggest danger is ingesting infected food or water.  Icecream is a no no; watch out for cocktails served in reused coconut shells, ice, raw seafood and buying food from street stalls.  A moment of carelessness can completely ruin your holiday and leave you spending most of your time in the hotel loo.

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