The Los Angeles County Department of Public Health said cases of the highly contagious norovirus are on the rise.
The department told Eyewitness News that they use a method called wastewater sampling to detect viruses, and that norovirus concentrations detected in wastewater have been increasing.
Health officials said recent wastewater tests covering a three-week period showed norovirus detection increased 154% in the city of Los Angeles and over 250% in the county…