Overview
- WasteWaterSCAN classified national norovirus activity as high for the week ending Dec. 12, with a 42% jump in median wastewater concentration compared with November.
- Los Angeles County reported sharp wastewater increases over a recent three-week span, including a 154% rise in the city and more than 250% countywide.
- CDC surveillance shows continued circulation, with 9.37% of 2,722 norovirus tests positive for the week ending Dec. 6, following autumn’s upward trend.
- Health agencies stress prevention through thorough handwashing with soap and water, staying home while sick, and using EPA List G products or bleach solutions for cleanup.
- Experts caution that many wipes do not fully inactivate norovirus and note clinicians are monitoring a GII.17 subvariant, with its impact still uncertain.