why a particular vaccine is not given to children who have already got the diseases in their lifetime
Dear student,
Certain cells in our body, known as the Memory B cells keep a memory of the previously attacked pathogens. In case those pathogens attack again, the Memory B cells recognise them and respond to the attack by exhibiting faster antibody production.
In case of vaccination, a weakened or dead pathogen is introduced inside a person. This induces the B cells not only to produce antibodies but also keep a memory of the pathogen that was provided in the vaccine.
As we can see, the activity of the Memory B cell is to keep a memory of the invading pathogens so that there can be quicker action(antibody production) if they attack again. So if one gets a disease in their lifetime, the B cells would have already kept a memory of the pathogen and it is not necessary to introduce that pathogen again via vaccination.
Hence it is not necessary to give a particular vaccine to children who have already got the disease in their lifetime.
Regards
Certain cells in our body, known as the Memory B cells keep a memory of the previously attacked pathogens. In case those pathogens attack again, the Memory B cells recognise them and respond to the attack by exhibiting faster antibody production.
In case of vaccination, a weakened or dead pathogen is introduced inside a person. This induces the B cells not only to produce antibodies but also keep a memory of the pathogen that was provided in the vaccine.
As we can see, the activity of the Memory B cell is to keep a memory of the invading pathogens so that there can be quicker action(antibody production) if they attack again. So if one gets a disease in their lifetime, the B cells would have already kept a memory of the pathogen and it is not necessary to introduce that pathogen again via vaccination.
Hence it is not necessary to give a particular vaccine to children who have already got the disease in their lifetime.
Regards