Sam came home from school with a cold caused by a virus and his sister, ana, caught it from him. sam got well and went back to school. a few days before ana got well, sam came down with a cold again. their mother said that ana had given the cold back to sam. how likely is it that their mother is correct, and what does it mean for ana's chances of getting sick again?
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Sam came home from school with a cold caused by a virus and his sister, ana, caught it from him. sam...
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