Norovirus is a contagious virus that can infect anyone, which can be got from an infected person, contaminated food or water or by touching contaminated surfaces.
It is the most common cause of viral gastroenteritis in humans and affects people of all ages.
Symptoms of the highly-contagious stomach virus include vomiting, diarrhoea, fever and body aches, typically patients recover within several days.
Grade I and II students of Shenzhen Baihe Foreign Language School began showing signs of food poisoning after experiencing stomach aches and vomiting on Monday afternoon.
The local authorities said that by Tuesday morning, 140 students out of the school's 1,400, showed similar symptoms.
An investigation by the local disease prevention and control centre showed the mass vomiting was caused by Norovirus infection.
However, the affected students were taken home by their parents for treatment, while classes were suspended in the affected grades.
The school will strengthen disinfection in public areas and ask staff to wash their hands frequently.
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