1 / 10At least 19 students of a school in Kakkanad in Kerala’s Ernakulam have been infected with norovirus, the authorities said. Some of the parents have also been diagnosed with norovirus.2 / 10Following the outbreak, online classes have been introduced for students from Class 1 to Class 5. The district health department has adopted preventive measures.3 / 10Although norovirus is usually mild in healthy people, it could seriously infect young children and elderly people with co-morbidities. The virus spreads through sewage and is contagious.4 / 10Norovirus is a highly contagious virus that is sometimes known as the 'stomach flu' or the 'winter vomiting bug.' Food, water, and surfaces that have been contaminated can all spread the virus. The oral-faecal route is the most common.5 / 10It infects people of all ages and is similar to diarrhoea-causing rotavirus. Outbreaks of disease are most common on cruise ships, in nursing homes, dormitories, and other enclosed settings.6 / 10Emerging data suggests that 'norovirus infection is related to intestinal inflammation, malnutrition, and may cause long-term morbidity,' according to the World Health Organisation. It goes on to say that an estimated 685 million cases of norovirus are seen each year, with 200 million instances among children under the age of five.7 / 10Vomiting and/or diarrhoea are the first symptoms of norovirus, and they appear one or two days after exposure to the virus.8 / 10Patients may also experience nausea, stomach pain, fever, headaches, and body aches. Loss of fluids can cause dehydration in extreme circumstances.9 / 10As the virus contains numerous strains, it is possible to become infected multiple times. Norovirus is resistant to a wide range of disinfectants and can endure temperatures of up to 60 degrees Celsius.10 / 10As a result, simply heating food or chlorinating water is insufficient to eliminate the virus. Many common hand sanitisers are also resistant to the virus.