The Sacramento Bee on MSN: Extremely contagious virus on rise in Northern California. What are noroviruses? Add Yahoo as a preferred source to see more of our stories on Google.

Understanding the Context

Norovirus typically enters the gastrointestinal tract via tiny viral particles from an infected person’s saliva or ... NBC New York: What is norovirus and why are Olympic athletes getting sickened by it? What is norovirus and why are Olympic athletes getting sickened by it? Amazon S3 on MSN: Norovirus 'two-bucket disease' is hitting Americans at record rates this spring Norovirus — nicknamed the 'two-bucket disease' for its sudden and simultaneous vomiting and diarrhea — continues to spread across the United States at unusually high spring rates.

Key Insights

CDC wastewater ... Yahoo: School Closed for 2 Days After Norovirus Outbreak Sickens More Than 130 Students and Staff School Closed for 2 Days After Norovirus Outbreak Sickens More Than 130 Students and Staff