As public health officials in California warn of a jump in reported cases of norovirus—also known as winter vomiting disease—across the state, a preholiday gathering in Seattle illustrates the speed with which the virus can wreak havoc in tightly packed events. The California Department of Public Health has confirmed 32 outbreaks that sickened hundreds between October and the end of 2015. Meanwhile, more than 200 people came down with symptoms of norovirus, which include abdominal …
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