> I noticed on
>several occasions that some of the people I met soon after Christmas had
>colds or flu, and I found this rather surprising because it is the middle
>of summer here (Australia) - not the time of year when you would normally
>expect people to get sick. So I decided that it was most likely the result
>of overindulgence in food over the Christmas period.

Also, doesn't the vaccine itself, spread it??