Analysis
If I was the World Health Official I would first make sure that the the chicken pox virus was required for all children before they were able to enter kindergarten, because although there are state laws, there is no federal law requiring it. Then I would research cases in which the vaccine didn't work and try to make the vaccine for chicken pox foolproof. Finally I would hire the best scientist to try to devolp a medicine, or vaccine that once you get chicken pox, can go into your system and kill the inactive shingles virus in children, and not just people over 60.