Yale University Jun 26 2026 Reviewed As the leading cause of viral gastroenteritis worldwide, norovirus is an all too familiar ailment. Its telltale digestive upset — not to mention its reputation for being notoriously contagious — has earned it the nicknames "winter vomiting bug" and "stomach flu." Yet despite millions of dollars spent on research, there are still no vaccines or anti-viral drugs for norovirus. A new Yale study, however, offers an important clue into where future treatments