Norovirus cases continue to climb in the US, especially in the Northeast, CDC data shows CNNViolent, diarrhea-inducing stomach bug spreads in Northeast: ‘Incredibly contagious’ Yahoo NewsNorovirus spreading in the Northeast, CDC data shows NBC NewsNorovirus cases soar in California. Here are signs to watch for San Francisco ChronicleIt’s peak norovirus season. Here’s what you can do to avoid getting sick WPRI.com