By Ethan Covey
A large CDC study found that the GII.4 strain of norovirus is responsible for most norovirus outbreaks, and causes more severe disease outcomes than other strains.
The strain also occurred more frequently in health care settings, affected older adults, and caused more severe illness, leading to hospitalization or death.The study reviewed data from two complementary surveillance systems—the National Outbreak Reporting System (NORS) and CaliciNet—to provide a