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Sonoma County has had four norovirus outbreaks in the past month. There were three outbreaks in June and one last week. Three of them were in healthcare facilities, including local hospitals. The fourth outbreak was at a residential substance use treatment center. Public health officials say high levels of norovirus have also been detected in Sonoma County’s wastewater in recent weeks. The CDC says norovirus is the leading cause of vomiting, diarrhea and foodborne illness in the United States.