Viruses are contagious, but prevention is possible.
For starters, if you have a baby be sure she gets the rotavirus vaccine, which is given between 2 and 6 months of age. Researchers are working on a vaccine for the norovirus. For now, the best protection is to wash your hands often and use alcohol hand gel if you can't get to a sink. If someone in your family has a stomach bug, wash hard surfaces frequently with disinfecting wipes. Don't share utensils, cups, pillows, or towels, and cut your child's fingernails to prevent viruses from lingering underneath.