Norovirus cases appear to be increasing in Los Angeles, according to wastewater data released by the Los Angeles County Department of Public Health. Sampling shows norovirus levels rose 154% in Los Angeles and more than 250% countywide over a 21-day period ending Dec. 11, data reported by ABC News’ KABC.
Health officials say the increase aligns with seasonal patterns, as norovirus outbreaks are more common during cooler months, typically from November through April.
Local Spike Reflects National Trends
The rise in Los Angeles mirrors trends seen across the country. In mid-November, nearly 13% of norovirus tests nationwide were positive, up from about 7% three months earlier, according to the Centers for Disease Control and Prevention.
More recent CDC data suggests national cases may be easing slightly, with about 9.4% of tests returning positive results during the week ending Dec. 6.
What Is Norovirus?
Norovirus is a highly contagious virus and the leading cause of viral gastroenteritis, an inflammation of the gastrointestinal tract. Often called the “stomach bug,” it is not related to influenza.
The virus is responsible for about 58% of foodborne illnesses in the U.S. and causes an estimated 25,000 outbreaks each year, according to the CDC.
Symptoms and Duration
Common symptoms include nausea, vomiting, stomach pain and non-bloody diarrhea. Some people may also experience fever, headaches and body aches.
Symptoms usually develop within 12 to 48 hours of exposure and typically last one to three days in otherwise healthy adults.
Prevention and Safety Tips
Health experts say thorough handwashing with soap and water for at least 20 seconds is the most effective way to prevent infection. Hand sanitizer alone is not sufficient against norovirus.
The CDC recommends washing hands after using the restroom or changing diapers and before eating or preparing food. Local health officials also advise washing produce carefully and fully cooking shellfish, noting that freezing does not kill the virus.
Anyone infected with norovirus should avoid preparing food for others for at least three days after symptoms have ended.
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