India, May 20 -- The World Health Organization openly worried on Tuesday over the "scale and speed" of an outbreak of a rare type of Ebola in eastern Congo, where authorities reported a sharp increase in suspected deaths - to at least 134 - and more than 500 suspected cases. The virus spread undetected for weeks after the first known death as authorities tested for a more common type of Ebola and came up negative, experts said. The Bundibugyo virus has no approved medicines or vaccines. Meanwhile, an American in the DRC contracted the virus, US officials said. The US said it is bolstering precautions to prevent the spread of Ebola, including screening air travellers from outbreak-hit areas and temporarily suspending visa services.P14...