Inactivated viruses are vaccines. Since it is inactivated, how can we fight the virus?

Inactivated viruses are vaccines. Since it is inactivated, how can we fight the virus? To solve this problem, let's first understand what a vaccine is. How does it play an antiviral role?

Vaccine is an active immune preparation to prevent infectious diseases, which takes pathogenic microorganisms such as bacteria and viruses and their metabolites as raw materials and is made by attenuated, inactivated or artificial transgenic methods. Vaccine is a preventive biological product used for human immunization to prevent and control the occurrence and prevalence of diseases. The body obtains corresponding immunity through vaccination.

So how does the vaccine work? The human body has something called the immune system, which is equivalent to the army sent by our body to fight the virus. After receiving the signal of virus invasion, they will take corresponding measures to produce antibodies and destroy the virus. So what is an inactivated vaccine?

Inactivated vaccine, also known as dead vaccine, has no pathogenic ability at all, but relatively retains the structural characteristics of the virus. In other words, our body can recognize it and produce an immune response, which is called immune response.

After the inactivated vaccine enters the human body, the immune cell B cells receive the battle signal, and with the help of T cells, they summon antibodies for the body and destroy the invading virus. Some B cells differentiate into memory B cells, and the memory B cells will be activated immediately after the next injection, which will produce an immune response quickly and efficiently and secrete more antibodies. It should be noted that inactivated vaccine needs to be injected many times, and it takes a certain time interval to play its role in preventing diseases to the greatest extent.

There is also a vaccine called live attenuated vaccine. The virus in this vaccine still has some vitality, but it won't make people sick. After re-inoculation, because the pathogen has certain growth and reproduction ability in the body, it can enter the cell to reproduce. After receiving the invasion signal, T lymphocytes can differentiate into effector T cells, which are more malicious and can directly kill human cells invaded by viruses, thus playing a role. Therefore, the attenuated live vaccine has a good and lasting immune effect, and generally only needs to be vaccinated once. However, this vaccine has certain toxicity and is not suitable for patients with low immunity and life immune deficiency.

In a word, the discovery of vaccine is a milestone in the history of human development. Because in a sense, the history of human reproduction is the history of human constant struggle with diseases and natural disasters. Prevention is the most important means to control infectious diseases, and vaccination is considered to be the most effective measure.