People who have suffered from influenza, like other infectious diseases, can develop resistance. After the influenza virus enters *, it can stimulate *’s immune system, causing people to develop specific resistance, which has the effect of killing the influenza virus. In addition, when influenza virus infects the respiratory mucosa, it can also stimulate the local immune system, form local resistance, and kill the influenza virus locally in the respiratory tract.
People can actually get flu multiple times in their lifetime, what’s going on?
Firstly, the infectivity of influenza virus is very strong, as only a small amount of virus can cause infection. In addition, the toxicity of influenza virus is also very strong, and infection can cause illness in people. Secondly, influenza viruses are divided into three types: A, B, and C, and the virus is prone to mutation. The specific resistance to a certain type of influenza virus is not resistant to other types of influenza viruses or to influenza viruses with the same type of mutation. Therefore, after being infected with one type of influenza, one can also develop other types of influenza. If the influenza virus mutates, even people who have been infected with the same type of influenza will get sick again. Thirdly, after being infected with the influenza virus, the specific resistance produced in the body lasts for a short period of time, usually only about six months, and the resistance disappears. It is also possible to contract the influenza virus and get the flu.
Due to the above reasons, a person may repeatedly get the flu throughout their life.