Norovirus cases are spiking this winter. Here's why — and what you need to know to protect yourself. Business InsiderNorovirus cases are surging. A doctor explains what to look for CNNWhat's the best way to kill norovirus, the 'stomach bug'? Livescience.comNorovirus cases on the rise in Austin, doctor says FOX 7 AustinNorovirus cases are surging in New York City.