First, the good news: While food poisoning symptoms can linger for up to a week, Dr. Dasgupta says most cases clear up in a ...

In previous years, the U.S. saw norovirus outbreaks increase around December, which marked the start of the season of the virus. Between 2011 and 2024, GII.4 viruses caused less than 50% of US ...

Increase in outbreaks of norovirus GII.17 over GII.4, United States, 2022–2025. Seasons are defined as September 1 of one year to August 31 of the next.