Do I still wear a mask after vaccination?

How effective and safe is the vaccine?

Zhong Nanshan's latest response is here!

　　Today (31st), the "Helping Grassroots Epidemic Prevention and Control Thousand Miles" activity was launched in Guangzhou. Academician Zhong Nanshan answered questions related to grassroots epidemic prevention and control during the Spring Festival.

No need to wear a mask after the new crown vaccine?

Zhong Nanshan: The answer is no

　　A reporter asked whether I don’t need to wear a mask after being vaccinated.

Zhong Nanshan said that the answer is no. China’s vaccines are mainly whole-virus inactivated vaccines, which are very safe. For evaluation of its effects, antibodies usually appear after the first dose. This antibody is about 60%. 70%, 14 days after the second injection, its antibody level can reach protection close to 90%.

At least two to three weeks after the vaccine is given, there will be no antibodies. There is still a risk of infection between the injection of the vaccine and the production of antibodies, and personal protection should also be paid attention to.

Data map: The staff are vaccinated against the new coronary pneumonia.

Photo by Shen Meiping

Infected people are asymptomatic and have obvious infectiousness. Rural areas are now the top priority of the epidemic

　　Zhong Nanshan said that rural areas are now the top priority of the epidemic. From the recent incidence, it seems that 60% to 70% of epidemics occur in rural areas.

Zhong Nanshan said that many ordinary people at the grassroots level in rural areas think that if they are infected with the new crown virus, they will have serious symptoms and must be hospitalized. Therefore, when he has simple symptoms, such as headaches and brain fever, he does not pay attention to it. Resistance passed.

But in fact, most patients with new coronary pneumonia are mild, and many are asymptomatic.

Because the transmission rate of the new crown virus is very high, it is difficult to go to the doctor after being sick, which will eventually delay yourself and infect others.

　　Zhong Nanshan reminded that for epidemic prevention in rural areas, village doctors must be vigilant. Don't let anyone come to see the doctor, just take some anti-fever medicine and Chinese medicine.

Once the patient has a headache, sore throat, fever, or fatigue, the patient must be required to undergo a nucleic acid test.

　　Zhong Nanshan pointed out that he hopes to solve the problem of inconvenient nucleic acid testing for the common people.

In some rural villages, people from all villages gather to take a bus to the county for testing. It takes time and is prone to cross-infection. Mobile vehicles should be used to go to the village to be checked. Don’t let the common people mobilize people. This is a very important manifestation of technology.

　　One feature of new coronary pneumonia is different from SARS. Even if it is infected with the virus, it may be asymptomatic, but it is obviously contagious without symptoms.

Therefore, during the Spring Festival, people in rural areas must: 1. Stop visiting and partying; 2. Go to a doctor if you feel unwell, and don't wait for a serious illness. 3. Take a nucleic acid check in time.

I don’t think the cases of nucleic acid transfer are highly infectious

　　Recently, in some areas, after a confirmed case of new coronary pneumonia recovered, the nucleic acid test turned positive.

In this regard, Zhong Nanshan said that he did not believe that the cases of transfer to Yang were very threatening and highly contagious. It is possible that these cases have remnants of nucleic acid fragments.

However, the presence of nucleic acid fragments does not mean that there is a live virus. It is rare to see that the nucleic acid turns positive and can infect others.

China's vaccines are safer and produce antibodies for at least half a year

　　Zhong Nanshan said that China's vaccines are relatively safe, and the production of antibodies lasts for at least half a year.

　　Zhong Nanshan said that the difference in the effectiveness of vaccine clinical trials lies in the different standards.

Regardless of whether it is Coxing or Sinopharm vaccines, our phase I and phase II trials have been completed in China, but there is no place for phase III trials. Because there are not many patients in China, we need to spend a lot of time to negotiate with countries with epidemics. In the third phase of the trial, some countries want to do it themselves, so the standards of different countries will be very different, and we have to withstand more tests.

For example, in some countries, a large number of injections are made by medical staff. These people are at high risk of infection, so there are now different effectiveness data.

　　Zhong Nanshan said that the Chinese vaccine has been used for 7 months, almost 8 months, and the antibody is still at 90%.

The most important thing about vaccines is safety, and the safety and reliability of fully inactivated vaccines are relatively high.

The general side effect of mild cases is 6 per 100,000, that is, some fever after the fight, some pain in the arm, and 1 per million in severe cases.

We usually get three parts per million of the flu vaccine.

There will be adverse reactions to all vaccines, and it is impossible to have no response 100%.

The two Chinese vaccines, Sinopharm and Kexing, have vaccinated more than 20 million people worldwide.

Why does virus mutation make it more infectious?

　　Academician Zhong Nanshan said on the 31st that the most critical mutation of the virus now occurs in the receptor binding site of the spike protein, which easily opens the door for the virus to infect people, making it easier for the virus to invade the body and cause disease. This is the new crown The reason why the virus becomes more contagious.

So we have to track the mutated virus on the one hand, and also consider what kind of virus strain to use for vaccines after the virus mutates.

Is it possible that the toxicity of the new coronavirus will gradually change, and will it become flu-like, changing every year?

Every year we use the flu vaccine, the WHO predicts the three possible virus strains next year, and then we will make the vaccine.

In the future, whether the new crown virus will be like this, we must closely track it.

The current epidemic prevention and control faces new challenges such as case distribution and virus variants

　　Academician Zhong Nanshan said at the launch event of “Guangzhou Laboratory Science and Technology Helps Grassroots Epidemic Prevention and Control”, and now we have encountered a second challenge. One is the spread of cases, the spread in rural areas, and the encounter with several virus variants. , Has brought us many challenges.

We have recently conducted in-depth research on the effects of vaccines, which are very urgent to be solved.

As the number of patients decreased and the environment improved, some places relaxed their vigilance to a certain extent.

We must think carefully about why some areas are spreading and localized so much.

The Spring Festival is about to come, and we must do a good job of scientific research in an attitude of not waiting for time.

Whether the global epidemic situation can improve depends on February and March

　　Zhong Nanshan said that more countries are now vaccinating. As vaccinations increase, the prevalence of new crown disease will improve.

Whether the situation of the epidemic can improve depends on February and March.

In addition to intensive management, whether vaccination is one or two doses, it will take at least two to three weeks before antibodies are produced to have a more obvious protective effect.

After about March, we will be able to see the trend of the global epidemic.

　　Comprehensive from: CCTV News Client, Xinhua Viewpoint