This just isn't worth the risk. I agree with others to wait a few days.
In November I went to stay with friends on a Friday night whose daughter had been vomiting on the Tuesday. On the Friday night their son started with it and by the Saturday evening I was the illest I've ever been and hospitalized the following day (I was pregnant so impaired immunity may explain why I came down with it so quickly and severely). There had been 72 hours between their daughter and son getting it so I'd say that 48 hours isn't enough.