It's called Middle East respiratory syndrome, or MERS, after the region where almost all the patients have been reported. But the name may turn out to be a misnomer. A new study has found the virus in camels from Sudan and Ethiopia, suggesting that Africa, too, harbors the pathogen. That means MERS may sicken more humans than previously thought—and perhaps be more likely to trigger a pandemic. MERS has sickened 183 people and killed 80, most of them in Saudi Arabia. A couple of cases have occurred in countries outside the region, such as France and the United Kingdom, but...