Public health officials and specialists on infectious diseases have noted an increase in cases of norovirus infection in the United States in several areas, including in parts of California.
The virus is popularly known as the "vomit bug," because norovirus infections are among the most highly contagious stomach infections and one of the most common types of food poisoning in America. The virus can easily be transmitted through contaminated food, water, surfaces, or even direct human contact.
According to recent reports by the Pacific Crest Trail Association, hikers from Southern California suffered from symptoms associated with the norovirus infection, while infectious disease specialist Dr. Linda Yancey was quoted by NBC as saying that there have been a few cases of the virus in the San Francisco Bay area.
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"There really isn't anything unusual about this one in California. They were simply unlucky," Yancey stated.
What is norovirus and how does it spread?
Norovirus causes acute gastroenteritis, an inflammation of the stomach and intestines that often results in sudden digestive symptoms. According to the US Centers for Disease Control and Prevention (CDC), the virus spreads through direct contact with infected individuals, consumption of contaminated food or beverages, or by touching contaminated surfaces and then touching the mouth.
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Health experts note that norovirus outbreaks commonly occur in schools, hospitals, nursing homes, restaurants and cruise ships because the virus can spread quickly in crowded environments.
Data cited by NBC from wastewater surveillance programmes show norovirus activity remains elevated across several parts of the country, particularly in the Northeast.
Amanda Bidwell, scientific programme manager at WastewaterSCAN, told PEOPLE magazine that norovirus levels remain high nationally due to elevated concentrations recorded over recent weeks. According to CDC figures, participating states reported 1,194 norovirus outbreaks between August 1, 2025, and May 7, 2026.
Symptoms and health risks
The symptoms of norovirus usually take up to 12 to 48 hours before manifestation. Most common symptoms include nausea, diarrhea, stomach ache and exhaustion. Sometimes fever, headache, cold sweats and muscle pain may appear. According to medical professionals, a majority of infected people feel better between one and three days.
Dehydration is another problem associated with norovirus infection that can be dangerous especially for small children, elderly people and those having existing medical issues.
There have been reported cases of hikers becoming dehydrated as a result of the current outbreak; some even needed treatment in hospitals.
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How to protect yourself
Experts at the Centers for Disease Control and Prevention recommend washing hands frequently using soap and warm water, proper handling of food, cleaning contaminated surfaces thoroughly and maintaining good hygienic standards.
Authorities warn people showing symptoms to stop preparing food for other individuals until they have completely recovered.
Considering the continued prevalence of the virus in certain locations, health officials keep emphasizing the importance of taking necessary hygiene precautions.
