"It is too early to tell if this strain is associated with more severe norovirus disease but likely lower population immunity ...

Norovirus cases have reportedly been rising in the US since December last year. The US CDC describes norovirus as “a highly ...

FILE - This electron microscope image provided by the Centers for Disease Control and Prevention shows a cluster of norovirus virions. (Charles D. Humphrey/CDC via AP, File)(Charles D. Humphrey ...