Is it really necessary to get a flu shot?

Vaccination is the most effective way to prevent influenza. ? This sentence must have been heard by many people. But with this sentence, there are such things as? Is the flu vaccine ineffective? 、? Will you get the flu after the flu vaccine? 、? The flu vaccine is useless? Wait, rumors. Plus in the flu season, it will always appear? Not enough vaccine? In the news, many people's idea of preparing for vaccination is passively shaken.

Is the flu vaccine useful? You want to fight? Why is the supply and demand of vaccines unbalanced?

1. Is the flu similar to the common cold?

Don't! These are two different diseases. Cold includes influenza and common cold, that is to say, flu is just one kind of cold.

Although ordinary people put them in the same category, after all, from the symptoms, there is not much difference between the two at first. Generally, it is fever, headache, general weakness, sore throat and cough. However, the severity of the flu after its development is very dangerous and will lead to death. The disease burden of influenza is very serious. The incidence of influenza in the whole population can reach 5- 10% every year, and it is even higher in children, reaching about 20%. In addition, influenza can cause serious complications. WHO estimates that 290,000 to 650,000 people worldwide die of respiratory diseases caused by influenza every year. According to a recent study in China, from 20 1 1 to 20 15, the excess mortality rate of influenza-related respiratory diseases in China is 88,000. This shows that influenza is very harmful to people's health.

In addition, they can be distinguished by pathogens. The common cold is generally caused by a series of viruses such as rhinovirus, coronavirus and adenovirus, and the pathogen of influenza is influenza virus. Seasonal influenza viruses are divided into four types: A, B, C and D. Influenza A and B viruses can spread and cause seasonal epidemic diseases.

Second, the flu vaccine is ineffective. Will you get the flu after vaccination?

Influenza vaccine is recommended according to the strain predicted by WHO every year and needs to be vaccinated every year. There may be a mismatch between the recommended strain and the actual epidemic virus, so the effect of influenza vaccine varies from year to year. This is limited by the current technology, because we can't accurately predict the epidemic virus. In addition, no universal influenza vaccine has been developed. Generally speaking, if the matching rate is good, the protective effect of the vaccine can reach 70-80%, and if the matching rate is poor, the protective force can only reach 20-30%. ? In fact, if the vaccine has a moderate protective effect of 50%, as long as the vaccination rate is high enough, it will still form an immune barrier, reduce the incidence rate, and avoid hospitalization and death of many patients. ?

3. Why do some people think that influenza vaccination cannot prevent influenza?

The misunderstanding here is that vaccination can prevent influenza virus infection, but it cannot prevent respiratory tract infection or common cold caused by other viruses. It turns out that many people get sick after vaccination, but it is not caused by influenza, because many respiratory viruses and bacteria, such as respiratory syncytial virus, adenovirus or streptococcus pneumoniae infection, can cause similar symptoms. If you don't make a diagnosis through testing, there is no way to distinguish influenza from other respiratory complications. As for why the demand and supply of vaccines are not balanced, why do they often appear? Lack of vaccine? The hospital director said that this is indeed a very important issue. At present, vaccine manufacturers mainly rely on themselves to measure market demand, and the state does not make unified planning every year. In the long run, it is still necessary to improve the vaccination rate of the whole society and expand the policy of benefiting the people. In this way, the production and supply capacity of enterprises and our service capacity will be improved, and the contradiction between supply and demand of influenza vaccine will be alleviated. ?