Norovirus cases are surging. A doctor explains what to look for

The number of norovirus cases is increasing across the US, but there are ways to reduce your chances of infection and stave off dehydration and other symptoms.

​ The number of norovirus cases is increasing across the US, but there are ways to reduce your chances of infection and stave off dehydration and other symptoms. Read More Breaking News, Latest News and Videos | CNN