GlaxoSmithKline's ($GSK) Rotarix and Merck's ($MRK) RotaTeq, vaccines designed to fight rotavirus, did their jobs, a Journal of the American Medical Association (JAMA) study found. The number of rotavirus-related hospitalizations in kids under 5 fell by 80% after the shots went into routine use, and the hospitalizations in kids 5-14 years dropped by 70%. Report