Chicken Pox More Condition_symptoms Photo Why Do We Only Get The Chicken Pox Once But Other Viruses More Than Once?

Why do we only get the chicken pox once but other viruses more than once? - chicken pox more condition_symptoms photo

I know that in rare cases, some people get chickenpox May, more than once, but for most only once. However, viruses such as influenza, which can be harvested several times ... How is that?