Health officials suspect that a rare respiratory virus is the reason that hundreds of children across America have been sickened in recent weeks, according to a published report. The Denver Post reported that the Centers for Disease Control and Prevention believe that human enterovirus 68 is at the root of the epidemic, though testing of samples has not produced a definitive answer. The Post reported that officials at Children's Hospital Colorado have treated more than 900 children for severe respiratory illnesses since August 18, with 86 admitted to the hospital. At Rocky Mountain Hospital for Children, doctors put five children on a ventilator this week, including a 13-year-old boy whose condition deteriorated from a mild cold to a life-threatening illness overnight.