You may not have heard about this before, or it may be strange to you. How can a vaccine against the influenza virus or a vaccine against measles be the same virus that was injected with it to receive the vaccine? Let's get acquainted with the method of manufacturing vaccines and the three most important types.
Types of vaccines:
1- Live Vaccines
2- Attenuated live vaccines
3- Inactivated (killed vaccines)
First: Live Vaccines.
It is a type of vaccine that is made from live infectious agents without any modification of infectious agents. Such as the small pox vaccine, which is caused by the Variola virus, which is made from a virus called cow pox virus and not Variola Virus because it is not pathogenic, but it is antigenic that searches the human immune system and has antibodies and does not cause disease.
Second: "Attenuated live vaccines" or weak or weak live vaccines.
In this type of vaccination, lethal pathogenic viruses are treated to become weak, weak viruses incapable of causing disease. After they are injected, the immune system identifies them to make antibodies to them.
This type of vaccine should not be given to people who have immune system problems, such as: cancer patients
Patients receiving corticosteroids, or patients who are exposed to radiation, or who are pregnant.
Third: "Inactivated (killed vaccines)" or dead vaccines.
This type is considered one of the safest types, but less effective, as the patient needs because he receives the vaccine at least twice, separated by a period of time. The vaccine is made by killing the organism that causes the disease by exposing it to heat or some chemicals, but the organism remains able to stimulate the immune system to have bodies