Zhong Nanshan mentioned group immunity in his speech. What is group immunity?

Group immunity refers to the resistance of our population to infectious diseases. The prerequisite for the success of group immunization is that at least 70% ~ 80% of the population in China are resistant to achieving this goal. The higher this ratio, the lower the probability of infectious diseases. The most effective and safest way to achieve group immunization is vaccination. It is not advisable and risky to achieve group immunity only by gaining resistance after people are infected with infectious diseases.

With the global popularity of novel coronavirus, some countries even broke out. In the face of such a severe epidemic situation, Britain put forward the so-called group immunization program on March 13, 2003, which plans to make at least 60% people infected with novel coronavirus, and then achieve the goal of group immunization through autoantibodies. However, through the test of time, this goal has not been achieved, and it has also infected its prime minister and crown prince. At the same time, the number of infected people and deaths in China is still increasing. Therefore, the method of infecting oneself with novel coronavirus to produce immunity is not reliable.

Novel coronavirus is highly contagious, and people are generally susceptible. After infection, most of the symptoms are relieved, and the prognosis is good after active treatment. For the elderly or people with chronic diseases, their own immunity is relatively low, and the probability of severe or critical illness after infection is greater, and the prognosis is worse. Although most patients' symptoms have been relieved, this does not mean that novel coronavirus is a disease that can be recovered by autoimmune without treatment. Even mild patients need active treatment, and the vaccine has progressed to severe or critical illness.

The most effective measure to achieve group immunity is vaccination. Vaccination is to minimize the virulence of the virus through a series of treatments, but at the same time, it retains the irritation of the virus to the human immune system, which can make our immune system produce antibodies. After novel coronavirus enters the human body, the antibodies can be identified and removed. At present, China's vaccine has entered the clinical trial stage and will soon be put into clinical practice. Let's look forward to it. Before the vaccine enters the clinic, what we need to do is to adhere to strict prevention and control, do personal protection, minimize the chance of infection and prevent the spread of the epidemic.