hickenpox is not as common as is used to be, as there is a reliable vaccine for it. If possible, it is best to get a vaccine, instead of risking getting the chickenpox. Vaccines do not cause autism. It is also much better to not have chickenpox than to get it. Children who are exposed to chickenpox are likely to get shingles when they are older. Chickenpox is also likely to be worse in adults than in children. If you have already been vaccinated, then you will not get the chickenpox.