It would be really interesting to see the reaction from anti-vaxxers if there was a tattoo that did the same job (or better) as a regular vaccine. "This tattoo is my MMR vaccination!" 
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Ah, the sentence you went into medicine to say.
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I was once told that one tattoo is a drunken night's mistake. Two or more is a sociopath. While I don't agree with this statement, I wonder about anyone claiming that tattoos will boost their immune system.
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Ha...haven't heard that one before...
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