"By the numbers: Cases of norovirus have doubled over the last few weeks, according to new data from the Centers for Disease Control and Prevention. About 14% of tests for norovirus came back positive during the week of Nov. 15, double the roughly 7% positivity three months ago, the CDC data show. Test positivity, though imperfect, generally helps health officials understand how many people are confirmed to have an illness when it is suspected."
"Norovirus can cause extreme cases of vomiting and diarrhea due to the inflammation of the stomach and intestines, per the CDC. This is why some refer to norovirus as the "extreme vomiting disease." Norovirus is also the top cause of vomiting and diarrhea, the CDC says. Roughly 20 million people contract the norovirus every year, per Scientific American. Norovirus is different than the stomach flu, which comes from the influenza virus."
Norovirus test positivity has doubled recently, rising from roughly 7% three months earlier to about 14% during the week of Nov. 15, after peaking near 25% in December 2024. Norovirus infection causes intense vomiting, diarrhea, nausea, stomach pain, and dehydration from inflammation of the stomach and intestines. Symptoms typically appear within 12 to 48 hours of exposure. Fever, headache, and body aches are less common but possible. Approximately 20 million people contract norovirus annually. Severe illness can require medical attention or hospitalization for infants, young children, elderly adults, and immunocompromised people.
Read at Axios
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