highly infectious disease. reporter: they have reported aid growing number of cases in five public schools. harvard university has been coping with handfuls of infected students since the beginning of the school year. over at the university of missouri, more than 200 people have come down with the virus. the cdc says mumps cases have now surfaced in all but four states, with nearly 4300 infections reported. arkansas is the epicenter with nearly 2200 cases in mostly school-age children. what efveryone can do is mak sure you are up to date with immunization. reporter: lack of immunization could be to blame according to public health officials. several years ago rumors circulated that certain vaccine could cause autism in children. while that was later debunked, it still terrified many parents
winning the election or perhaps not receiving. why he isn t taking as many as perhaps the intelligence community would like him to. more on that. also major developments in the case in charleston, south carolina, the man accused of killing nine people, the trial under way, his own mother had a heart attack just this week. his confession tape was played in the courtroom today and cnn has chilling video of the accused gunman leaving the church with a gun in his hand. more on charleston next. and it s the worst outbreak in a decade. what is behind this unusual number of mumps cases. mumps in this country? where this outbreak is being felt the hardest. we ll talk to chief medical correspondent dr. sanjay gupta for that. i m brooke baldwin, you are watching cnn.