Santa Monica-Malibu Unified School District said students from John Adams high school on a five-day trip to Yosemite Sunday when several participants showed signs of gastrointestinal disease.
Some teachers and parents are also potentially exposed, according to a letter sent to parents and staff and published on the website of the school district. It is not clear how many people were infected in all things.
School officials told parents of students at John Adams middle school on Sunday, and officials from the Los Angeles County Department of public health has helped to track outbreaks of Yosemite trip.
About 190 7.-grade students were on the way, along with teachers and parents. The group returned Friday from Yosemite but did not step in to campus until classes resumed Monday morning, regional officials said.
Officials believe the same disease spread to other pupils at the school, who did not travel at Yosemite and the siblings who participate in other schools in the district.
"The challenge with this highly contagious disease is that of a child or adult can still be tasted good when they're contagious, hinder the detention," according to the city of Surat.
School officials say they are working with public health officials to prevent the spread of the disease.
Classrooms and other facilities cleansed with special products recommended by public health officials.
The tour, students ride the bus to Yosemite and slept in tents at Curry Village and residence halls at crane flat. A trip billed as a way to keep "far from any screen shiny and electronic," according to the school web site.
Norovirus is infectious organisms that can spread through contaminated food or water and human interaction, according to the Center for disease control and prevention.
Between 19 and 21 million illnesses are caused by norovirus each year, and it is considered the most common cause of food-borne disease outbreaks in the United States
An infected person usually experiencing stomach ulcers and colon as well as nausea, vomiting, diarrhea and abdominal pain.
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