(CNN) -- Evidence is mounting against camels as leading suspects in a deadly mystery that's claimed more than 100 lives in the Middle East. The biological supervillain is the virus causing MERS-coV, short for Middle East Respiratory Syndrome, a type of coronavirus. Since the first documented cases in spring 2012, MERS has sickened at least 339 people in Saudi Arabia alone and killed nearly a third of them, according to the country's Ministry of Health. A recent surge in reported cases -- including 26 new ones this past weekend -- has fanned concern the outbreak might be shifting into a more dangerous phase.
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