Norovirus sweeps two Boston hospitals

A wave of vomiting and diarrhea has swept through wards at Brigham and Women's and Massachusetts General hospitals and at a day-care facility run by Children's Hospital Boston. The norovirus outbreak left more than 70 patients and staff members ill. The caseshighlight the challenge of making sure that doctors, nurses, and other medical workers routinely and rigorously clean their hands to help avoid such outbreaks.