Recently. "The child of the first stream just happened to be recruited by the second stream".
It's on the hot search!
According to the latest surveillance data released by the Chinese Center for Disease Control and Prevention and the National Influenza Center, the current round of influenza epidemic in China has entered a period of decline, but the proportion of influenza B continues to rise. Like influenza A, influenza B is highly contagious and spreads quickly, and should not be underestimated.
What is Stream B
Influenza is an acute respiratory infection caused by influenza viruses. Influenza viruses can be divided into three types: A (a), B (b), and C (c). Influenza B (abbreviated as influenza B) is caused byEpidemic caused by influenza B(b) virus**.
The incubation period of influenza B is mostly 1 4 days.
Infections in children often have a sudden onset and are commonFever (body temperature up to 39-40), headache, muscle aches, general weakness, loss of appetiteand other systemic symptoms, accompanied by respiratory symptoms such as cough, sputum production, nasal congestion, runny nose, and sore throat. Gastrointestinal symptoms such as nausea, vomiting, abdominal pain, and diarrhea are more pronounced than those of influenza A. The sick children are mainly concentrated in the school-age stage, and most of them are infected in clusters, and the children in the lower age group are mainly infected by other family members because of the limited activity space.
A stream B six questions and six answers
Which is more severe, influenza A or influenza B?
Why in this recent wave of flu.
Middle and high school students seem to be better than that.
Kindergarten children are more likely to be "recruited".
After getting the flu.
When will it be more "scientific" to return to school?
Come and hear about the hospital.
Department of Respiratory and Critical Care Medicine, Department of Infectious Diseases.
Answers from pediatric experts.
What is the difference between B and A?
There are some differences between influenza A and influenza B in terms of transmission routes, symptoms caused, and infectivity, but there are also many similarities.
In general, influenza A and influenza B are similarly infectious, butInfluenza A is more likely to cause more severe epidemics due to its ability to genetically mutate。Of course, the specific symptoms and course of infection vary from person to person. Staying up to date with your flu vaccine is important to prevent both types of flu
High school students are more likely to be infected than kindergarten children
Influenza is universally susceptible to all populations, from the point of view of the disease itselfThere is no problem of differences in the probability of infection between different age groups
Places where people gather are more likely to develop the disease. For example, in schools, children stay together for a long time, and as long as one person is infected, if measures are not taken in time, the infection will usually expand quickly. Younger children have not fully developed their respiratory tract and have relatively poor immunityWhen there is a flu patient in a dormitory or a class, it is indeed difficult to avoid the recruitment of classmates.
Many high school students do not want to delay their studies, and may want to carry it in the early stage of symptoms, and the most contagious time for the flu is precisely the first two or three days after the symptoms appear. Therefore, it is also recommended that children inform teachers or parents as soon as possible if they have symptoms.
Kindergarten children do not have any academic pressure, as long as there are symptoms or even classmates have symptoms, parents will take preventive leave, and the probability of infection is naturally lower.
If I have had influenza A or influenza B, will I be re-infected?
Influenza A and influenza B are two different subtypes of influenzaThere is no cross-immune mechanism。After influenza A or B infection, if the patient is relatively weak, there is still a chance of infection with another subtype of influenza virus.
The influenza vaccine can prevent both influenza A and influenza B, and people who have been vaccinated are less likely to develop influenza A and B in succession.
In general,It is unlikely that you will be infected with the same subtype of influenza virus within a year。For example, if the A(H3N2) subtype of influenza A virus is currently circulating, and the patient will have immunity to this type of virus after infection, the probability of reinfection with the same type of virus within one year is small. However, because influenza A viruses mutate easily, people who have not been vaccinated may be reinfected with other subtypes of influenza A viruses.
In recent years, because the influenza B virus has not mutated much, the spread range is relatively small, and the probability of reinfection with influenza B within one year is also small.
Why do some people have a fever four times in two months?
Individual adults or students with poor physical fitnessIf the virus has not been completely cleared from the body in the previous time, fever will also occur after secondary infection.
In addition, in addition to the flu, there are respiratory diseases such as respiratory syncytial virus, coronavirus, and Mycoplasma pneumoniae in autumn and winter, and symptoms such as fever and cough can also occur when you are sick.
How Long After Flu Fever Can I Return to School?
The course of upper respiratory tract infections caused by influenza is inA week or soAfter a week, the number of viruses will be significantly reduced, and the antigen or nucleic acid test will be basically negative, which also means that the virus is much less contagious, and it is safe for classmates to return to school.
For high school students, especially juniors who are in the sprint stage, it is indeed unrealistic to take a week off. There are quite a few schools now that advise childrenReturned to school after 48 hours of feverThis one is also relatively scientific. In general, after the body temperature is normal, the viral load in the body has been greatly reduced, and even if the virus is still transmitted, the possibility of causing illness is not too great. Of course, this does not mean that you do not need to take precautions, and it is recommended that both the patient and his classmates wear a mask for a week.
There is also the possibility of a crypto-infected person, who has no symptoms, but has been infected with the virus and is short-term contagious. The virus that is excreted from the body through droplets such as coughing and sneezing can remain in the air for about 30 minutes, so it is best to cover your mouth and nose with a tissue when sneezing or coughing without wearing a mask, and do not throw away used tissues.
How to increase children's immunity in daily life?
Vaccination is an important means of preventing influenza in children, and the best time to vaccinate is generally recommended when the peak of influenza arrivesThe first two or three months。After vaccination, antibodies will be produced in the body in 2-3 weeks, and the protection period can basically last for one year. With the Chinese New Year approaching and social mobility increasing, children who have not been infected with the influenza virus can still seize the opportunity to get the flu vaccine.
In addition, schools and residences should be ventilated regularly, especially if there is a flu patient in the homeMaintain ventilationto reduce the concentration of virus in a confined environment;Reduce going to densely populated places, in public, especially when going to the hospitalDefinitelyWear a mask；DailyWash your nose with salineto help reduce the chance of viral infection.
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*: Dongyang Center for Disease Control and Prevention Health Jinhua.
Editor: Lu Anran.
Second trial: Jiang Zhi.
Final review: Wang Zhonghua.