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How Safe Is Samui? - October 2019 Update Including Koh Phangan

So how safe is Koh Samui? There's been plenty of confusion and panic. Is it OK to swim? How many of these 'killer jellyfish' are there? Where are they? What do they look like? How big is the risk? What do I do if I get stung? Here is the original guide, followed by a October 2019 update.

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