What factors affect immunity and its formation?

First, heredity. A certain part of immunity depends on the information hidden in the DNA, which is received from the parents. In addition, there is a risk of genetic diseases that can severely damage the immune system, such as DiGeorge syndrome. At birth, the baby receives immunoglobulins from the mother, which remain in his blood for six months. Secondly, environmental factors affect immunity, for example, ionizing radiation, some viruses suppress immunity, up to its complete destruction.