The fact that someone has had shingles once does not provide any immunization against it returning. However, although some people get shingles twice, additional occurrences are very rare. Medical researchers have looked into why a person who had shingles in their younger years might suffer from it again later. Up until now, they have not reached any definite conclusions, but they strongly suspect that there is a link with a weakened immune system – it seems like this opens the way for the infection to reappear.

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