Qu'est-ce qu'un vaccin?

In the current health situation, it is important to know what a vaccine is and how it works. This video starts from the notion of micro-organism to explain that some of them can be pathogenic. The body has natural barriers to protect itself from viruses and bacteria (skin, mucous membranes). Nevertheless, they can enter the body and make it sick. The immune system then defends itself by creating antibodies. The vaccine contains a form of the virus so that the body makes antibodies that are ready to destroy the virus when it arrives. There is no universal vaccine and each one corresponds to a disease. If a virus mutates (flu), it is necessary to be vaccinated several times if you want to have the right antibodies.