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In my readings, several authors have suggested that excessive/prolonged exposure to UV (particularly UVA) can have harmful long term effects on the human immune system. This leads to my question, what are the effects of excessive UV exposure of the human immune system?

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put on hold as too broad by WYSIWYG, Chris, Cornelius, MattDMo, Bez 8 hours ago

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VERY interesting question –  user4255 Aug 20 '13 at 9:26
UV can cause mutation in DNA . –  biogirl Aug 20 '13 at 10:00
@biogirl very true, but what I am after in this question is the specific effects on the immune system –  user3795 Aug 23 '13 at 14:52