as sick as a dog, with a violently upset stomach. The culprit: norovirus, the dreaded and contagious stomach bug that appears to be on the uptick across the northeast in the past few weeks.

These fast-spreading bouts of gastrointestinal distress are often caused by norovirus, colloquially known as the "stomach bug" or "stomach flu." Norovirus is highly contagious and the leading ...