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How can one person in a house have a cold and no one else catches it?

One person in our house is really sick with the flu or a cold and no one else has caught it. Why not? Its going on 4 days now.

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    That person may have a weaker immune system, if you are planning on not getting sick I'd start taking vitamins. Emergenc works really well, it's like a fizzy thing you put in water, it doesn't taste wonderful but it works like a charm, he may not be contagious as well. But really you should hype up on vitamins.

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