What is the principle of people developing vaccines? What's your opinion?

Throughout human history, there have been many epidemic periods, no matter which one has brought misfortune, countless lives lost and huge economic losses. Take the COVID-19 epidemic that is sweeping the world at present. Some professional organizations predict that this epidemic will bring 82 trillion US dollars of economic losses to the world. Under this premise, vaccine, as the most economical and effective means to prevent and control infectious diseases, can be said to have emerged.

Vaccine, as its name implies, refers to biological products made of various pathogenic microorganisms for inoculation. His working principle is simple. Generally speaking, viruses/bacteria can reduce their harm in various ways, while retaining their characteristics of stimulating animal immune system. When such a vaccine is injected into the body, the immune system will automatically protect and remember it. Until the next time a similar pathogen invades the body, it can automatically identify and produce more protective substances according to the original memory.

If you still can't understand it, you can use the following inappropriate example to illustrate it: In order to educate children that wolves are terrible enemies, mother sheep deliberately puts wolf skin on her baby? Fight? A meal, causing some minor injuries, let the child know that the wolf will hurt him, so that the next time the baby sheep sees a real wolf, he can take precautions in advance.

There are many kinds of vaccines, such as attenuated, inactivated, toxoid, nucleic acid vaccine and so on. So, does inactivation sound familiar to you? Yes, we should generally vaccinate against the COVID-19 epidemic with inactivated COVID-19 vaccine, that is, kill novel coronavirus sharks, reduce their toxicity, and inject them into the body to achieve the purpose of defense. For inactivated vaccine, its advantages and disadvantages are self-evident, its safety is very high, and generally it will not produce too many side effects, but it will cause the immunogenicity to become weak enough, which often leads to the need to strengthen immunity.

Having said that, do you have a preliminary understanding of vaccines? Here, I advise you to pay attention to the role of regular vaccines and defense.

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