The last reason why children should be vaccinated is because child vaccination helps the elderly as well. For example, if the child is ill and it is contagious, it will affect elderly because they are the one who is looking after that child. As we all know that, if elderly gets sick they cannot handle themselves because they are too old to fight for it. Firstly, they do not have enough strength to fight. One of the research (nia.nih.gov) says that, “Our immune system is a complicated network of cells, tissues, and organs to keep us healthy and fight off disease and infection. The immune system is composed of two major parts: the innate immune system and the adaptive immune system. Both change as people get older”. This shows our immune system
