A novel virus from Peru and the Republic of Congo called enterovirus C105 is now suspected in last year's wave of mysterious cases of sudden childhood paralysis. Initially, enterovirus D68, the respiratory virus that took the lives of 12 children in the US last year, was the main suspect in these polio-like illnesses, involving at least 118 children, including a cluster of cases in Denver, CO and another in Syracuse, NY. But soon researchers admitted they were stumped. In the fall of 2014, the CDC asked clinicians to report all such pediatric paralysis cases. Today, disease detectives at the University...