I don't know if this is any help to anyone, but we had an outbreak near me and my mother caught Norwalk, the Dr confirmed thats what it was she was so ill. But I never caught it even though I had shared a drink with her hours before she V*.
Though I have to say, I'm scared this winter because my family are all very close and we just moved near them and usually if one gets a bug they all do and I'm scared of my mum bringing it into this house, and it's more likely this year than ever before.
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Be courageous, believe in yourself, and be the best woman you can be. I'm with you all the way.