related_tweet: @sixxbri @sob1408 @brian_sack @shsykessue @wallyboo99 @chelseaclinton @girlsreallyrule @unicef @jennymccarthy chicken pox can be deadly in adults. if you had chicken pox as a child you can develop shingles and an adult with shingles can infect unvaccinated children with chicken pox. measles can cause blindness, deafness, and other serious secondary infections.