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

Helen Down holds her 14-month-old daughter, Amelia, for an MMR shot in Swansea, Wales, April 2013. The vaccination was in response to a measles outbreak. Geoff Caddick/AFP/Getty Images hide caption

itoggle caption Geoff Caddick/AFP/Getty Images

Lisa Schlager of Chevy Chase, Md., demonstrates outside of the Supreme Court as arguments were made in a case seeking to determine whether the BRCA breast cancer genes can be patented. The court ruled in 2013 that individual genes can't be patented. Tom Williams/CQ Roll Call/Getty hide caption

itoggle caption Tom Williams/CQ Roll Call/Getty

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

Depression and chronic pain are associated with dry-eye syndrome, a British study finds. And it's more likely as you age. Boris Lyubner/Illustration Works/Corbis hide caption

itoggle caption Boris Lyubner/Illustration Works/Corbis