Norovirus, beware of winter and spring gastrointestinal disease “killer”!
In winter and spring, when the weather is cold, people generally think that food does not spoil as easily as in summer.In fact, food poisoning can also occur in winter and spring, especially beware of food-borne illness caused by norovirus!What is norovirus?The most common symptoms of norovirus diarrhea are diarrhea and vomiting, followed by nausea, abdominal pain, headache and fever.Isn’t that similar to an intestinal infection?Yes, norovirus is the main cause of acute gastroenteritis clusters, but it is not just the result of eating norovirus contaminated food. It can be transmitted from person to person and through water, and low doses can cause widespread transmission.What is the spread of person-to-person contact?Direct contact with cases;Vomit from contact with the case;Feces and other excreta from contact cases;Exposure to contaminated environment, etc.Among them, vomiting is the most effective way to spread norovirus in public places.In addition, norovirus can spread more widely through hand to hand contact with contaminated objects.What is food transmission?Cold vegetables, fruits, and uncooked ready-to-eat shellfish are not cooked and heated before eating, and susceptible people ingest the virus after water is contaminated by infected people.Norovirus has stronger environmental resistance than normal viruses and can survive for up to two weeks on surfaces and more than two months in water.Currently, there are no separate antivirals and vaccines for norovirus.Due to the lack of lasting immunity after infection with norovirus, the general susceptibility of the population and the wide range of transmission routes, it is easy to cause outbreaks of norovirus, especially in the collective environment such as nurseries, schools and nursing homes.1. Wash your hands with soap and running water Washing your hands for at least 20 seconds is an effective way to reduce the risk of norovirus infection.2. Avoid making food with bare hands, especially cold dishes, which can effectively prevent the spread of norovirus through food.3. Avoid raw and cold foods and undercooked and thoroughly cooked foods.4. The surface of doorknobs, toilet seats, faucets and public telephones should be disinfected with a newly prepared chlorine-containing disinfectant with a concentration greater than 1000 mg/mL.The cleaning sequence should be from possible low contamination areas to high contamination areas.5. Regular monitoring of drinking water is carried out, and it is forbidden to use well water or river water that has not been strictly disinfected as domestic water.6. Isolate cases effectively. If you need to remove contact with infected persons or handle vomit or excrement from infected persons, take proper personal protection and wear disposable gloves and masks.7. Food practitioners shall take stool or anal swab nucleic acid test for norovirus for 2 consecutive days, and shall be allowed to work only after negative diagnosis.Source: Yunnan Market Supervision Bureau Food Sampling Inspection Department, Kunming Customs Technology Center, Yunnan Market Supervision Administration