infant with vomiting and diarrhea - virus?

I'm having a hard time deciding whether vomiting and diarrhea in an infant (or even anybody) is more likely to be rotavirus or norovirus....can anyone help explain? If you have a 1 month old infant with vomiting and diarrhea, which is more likely?

Source: Student Doctor Network - June 4, 2016 Category: Universities & Medical Training Authors: GomerPyle Source Type: forums