The recent cold weather, kindergarten children vomiting, diarrhea increased, often many people in the class collective illness. This cold season vomiting, diarrhea, the cause, in addition to the famous rotavirus, there is also the Dragon’s norovirus. Collective diarrhea, beware of norovirus infection 1, norovirus is the most common cause of gastroenteritis in adults and children, and its infection is a common cause of endemic diarrhea occurring in the community context, and is also the most common cause of epidemic viral gastroenteritis that occurs around the world and involves people of all ages. 2, norovirus infection can occur throughout the year, because the peak of infection often occurs in the winter low-temperature season, so called “winter vomiting disease”; because of the similarity with the influenza virus, with rapid transmission, easy to cause disease outbreaks, and also has a “gastrointestinal flu “called. 3, norovirus is highly infectious, 10-100 virus particles can cause infection. 4, norovirus is extremely stable, can resist the killing methods applicable to most bacteria, including heating to 60 ℃ and chlorine disinfection. 5, norovirus genetically diverse and highly variable, every few years there will be new mutant strains, people can get infected several times in a lifetime. Most norovirus infection epidemics worldwide are associated with the emergence of new genotype II.4 strains of the virus. 6.Norovirus can be detected in the stool of patients from before the onset of illness to 2 weeks after recovery, but the most infectious period is during the illness and three days after recovery. 7, usually through the following ways to get infected: eating or drinking food or water contaminated by norovirus; touching objects or surfaces contaminated by norovirus, and then put your fingers in your mouth. 8, given the spread of norovirus in a variety of ways (including contact with environmental surfaces, airborne atomized vomit and human-to-human contact), infection outbreaks are difficult to control. 9, norovirus in confined places (such as child care institutions, kindergartens, schools, nursing homes, cruise ships, etc.) spread quickly and easily cause outbreaks. 10, after infection with norovirus, generally in 24 to 48 hours after the onset of acute gastroenteritis, the main symptoms are nausea, vomiting, fever, abdominal pain and diarrhea, also visible headache, chills and muscle pain and other symptoms; daily diarrhea is seen 4 to 8 times, the stool is dilute watery stool or watery stool, no mucus pus blood. In the infected population, children patients more vomiting symptoms, adult patients are more diarrhea. 11, norovirus gastroenteritis disease course is self-limiting, most cases of symptoms last 24 to 60 hours after the disappearance of their own or healed. However, children or the elderly and other susceptible populations, some norovirus infected patients will appear weight loss, severe dehydration, kidney failure or even death and other serious conditions. 12.Children must be evaluated, children with mild disease can usually be treated at home. 13.Usually no special treatment is needed, there is no special medicine, mainly through rehydration, correction of dehydration and electrolyte disorders. Oral rehydration salts are the most effective drugs to prevent dehydration and electrolyte disorders. Children’s diarrhea disease, focus on the prevention and treatment of dehydration 1, once the following symptoms appear, you need to send to the hospital: infants, do not eat or drink for several hours; severe abdominal pain; more mucus in the stool or blood in the stool; the child’s expression is indifferent, ignoring you; there are obvious signs of dehydration: for example, weight loss of more than 5%, lips, skin is obviously dry with thirst; no tears when crying; sunken eyes; infants 4-6 hours The older children have not relieved urine for 6-8 hours. 2.Children who are severely dehydrated or cannot take oral solution should be given intravenous rehydration. 3.Once fluid deficiency is corrected, reintroduction of age-appropriate meals can be started. Breastfeeding can be continued during diarrhea. 4. No appropriate antiviral therapy (e.g. ribavirin) is required. 5, do not need to use antibiotics: antibiotics on the virus is not useful, and antibiotics in killing bacteria at the same time will kill the normal flora in the intestinal tract, flora disorders and thus cause prolonged diarrhea. 6, measures to reduce the risk of norovirus transmission include: pay attention to hand hygiene; wear personal protective equipment when cleaning vomit or stool; use disposable rags to suck up vomit or stool and then dispose of it in a non-leaking bag to limit the aerosolization of body fluids; disinfect the surface of objects with hypochlorite solution. 7.There is no vaccine for norovirus.