Interesting article on 12 teenage schoolgirls that have all come down with a disorder called 'mass hysteria' for no apparent reason. The doctor who is currently treating them talks exclusively to TheWeek.co.uk and gives what he believes is the reason.
Article here: www.theweek.co.uk/health-science/44544/ny-schoolgirls-hysteria-doctor-blames-constant-terror-alerts#ixzz1k0yslEZI