Norovirus infection in a school in Gaozhou City

 Norovirus infection in a school in Gaozhou City

Gaozhou Health Bureau

September 30, 2020

Norovirus prevention knowledge

In recent years,

A familiar and unfamiliar virus

Strong into our eyes,

It is characterized by acute onset and rapid transmission,

Well known,

This virus is norovirus.

60% - 80% of winter diarrhea is caused by it.

Especially students are more susceptible to infection!

As a self limiting disease,

The symptoms usually disappear in about 3 days,

So, what is norovirus?

How does it spread? What are the symptoms?

How to prevent it effectively?

Norovirus is the most important virus causing acute gastroenteritis. It is infected all the year round and has a high incidence in autumn and winter. The main symptoms include nausea, vomiting, diarrhea, etc. patients often feel that the condition is very serious, and even severe vomiting can be repeated within a day; some people also have headache, fever, muscle pain and other symptoms. Norovirus infection is self limited, the general course of disease is 2 to 3 days.


In the infected population, children had more vomiting symptoms, while adults had more diarrhea.


Noroviruses belong to the genus norovirus of Caliciviridae. Among them, norovirus (g u2161 - 4) accounts for 70% - 80% of noroviruses in the world.

It produces new strains through regular gene recombination accumulation or point mutation, especially rapid mutation, and new mutants appear almost every 2-3 years.

Therefore, the immunity acquired after human infection with norovirus can not produce self-protection in the next transmission of the virus.

2. Strong environmental resistance

Norovirus has strong tolerance to various physical and chemical factors.

No matter incubated at 60 u2103 for 30 minutes, treated with 20% ether at 4 u2103 for 18 hours or exposed to room temperature and pH 2.7 for 3 hours, it still has certain infectivity.

3. Strong infectivity

Norovirus is highly infectious and can cause infection every 10-100 virus particles.

The virus can be transmitted through food, drinking water, life contact, air and other ways, among which fecal oral route is the main mode of transmission, followed by direct contact and air transmission.

It is easy to cause mass outbreak in kindergartens, schools, hospitals, communities, hotels, restaurants and other semi closed and crowded environment.

Norovirus can infect people of all ages, but the clinical symptoms of children, the elderly and people with basic diseases may be more serious, in addition, it is easy to cause complications.

Some people with norovirus say they are food poisoning or gastrointestinal cold. In fact, any food that is not cooked or processed can be contaminated by norovirus.


How to treat norovirus?

There is no specific antiviral drugs for norovirus infection, which is usually self limiting and self-healing. It is generally treated by rehydration therapy, nutritional support treatment and other methods.

Pay attention to rehydration: serious to oral rehydration salt or infusion, also can drink a small amount of salt sugar water or rice soup.

Avoid high fever: if you have a fever, you can first reduce the temperature physically and drink a small amount of water many times. If the body temperature is higher than 38.5 u2103 for more than two hours, oral antipyretic drugs should be taken.

Light diet: reduce meat, eggs and other high protein food, and easy to lead to bloating food intake, such as milk, soybean milk, etc.


1. Maintain good personal hygiene. In particular, remember to keep your hands clean. Wash hands before handling food or eating and after going to the toilet.

2. Maintain good food hygiene. It includes: selecting safe food raw materials, keeping food handling personnel and utensils clean, thoroughly cooking food (especially shellfish seafood), and storing food at a safe temperature. To prevent norovirus from being transmitted by food.

(function(){( window.slotbydup=window .slotbydup||[]).push({id:u5811557,container:ssp_ 5811557, async:true }In addition, only drink boiled tap water or bottled water from reliable merchants, and avoid drinks of unknown origin. In areas suspected of norovirus infection, skin should also be removed before eating fruits. 3. Maintain good environmental hygiene. Keep the indoor air circulation; isolate the existing infected persons; arrange the uninfected personnel to stay away from the contaminated area; disinfect the infected area thoroughly, and wear gloves and surgical masks. Source: Western Guangdong observation editor: he Yufang_ NN5632

In addition, only drink boiled tap water or bottled water from reliable merchants to avoid drinking drinks of unknown origin. In areas suspected of norovirus infection, skin should also be removed before eating fruits.