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Dirty Water Holiday
I'm in South America and the city beaches are rated too dirty to swim in by local authorities. Despite this I see many local people swimming in the ocean every day. They tell me they have built-up immunities and don't get sick like I would.

My question is do I go for building up these immunities myself? I will be here yearly for a few months for work.

What is the long term price of the immunity?
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