So its acquired immunity and the cells responsible are the B lymphocytes that produces antibodies against the virus. Memory is keep since first encounter of the virus by the immune system by way of the antibodies that was initially produced. The antibodies are there already, which makes it fast to act upon when expose again.
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Assuming that Kai is a child, telling him about his own diagnosis requires some thinking about what age is ideal for Kai to effectively understand his condition and prognosis.
If Kai is a child with special needs, for example, the prognosis must first be made to the parents, who must make the ethical decision on whether or not it is necessary for him to know in advance about his condition.
If parents decide that the child should know about their condition and prognosis, if these interfere directly in their routine and activities, it is necessary that the child has a professional and psychological apparatus to be able to assimilate their condition in the best way.
It is necessary that parents are prepared to deal with the needs of having a special child, adapting, giving all the medical and emotional support necessary for their complete cognitive development and quality of life.
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