Opportunity: An innovative vaccine out of chicken pox,
             ....given that the manner in which the blister's are caused ...it appears that aliments and other impurities ...beneath the layers of the skin are
driven out.

Given the context and requirement a innovative vaccine
that can be taken once in a while ...that can cleanse
the impurities present in the sebacious glands of the
body.

Caution: apply use-case modelling ..and proper 
         rationalization ...while developing such a 
         vaccination.

Note: also given the nature of human mind ...it may 
      be placed in lieu of  a contraceptive ...remove
      ...any confusions or apprehensions.