Camels are displayed during the Mazayen al-Ibl competition, a parade of the “most beautiful camels”, in Tabouk, 1500 km (932 miles) from Riyadh in this November 27, 2012 file photo. Scientists believe camels in Saudi Arabia are the main animal reservoir of MERS, a new disease that kills about a third of sufferers and has infected 339 people in the kingdom. Picture taken November 27, 2012. REUTERS/Mohamed Alhwaity/Files (SAUDI ARABIA – Tags: SOCIETY ANIMALS HEALTH)