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PCR tests like this can tell if a virus is an enterovirus, but they can't ID the new virus that has caused a surge in serious respiratory infections. BSIP / Science Source hide caption

itoggle caption BSIP / Science Source

13-year-old Will Cornejo of Lone Tree, Colo., recovers at Rocky Mountain Hospital for Children in Denver from what doctors suspect is enterovirus 68. His parents found him unconscious on the couch and called 911. He was flown to Denver for treatment. Cyrus McCrimmon/Denver Post/Getty Images hide caption

itoggle caption Cyrus McCrimmon/Denver Post/Getty Images