Scientists tracking the Ebola outbreak in Guinea say the virus has mutated. Researchers at the Institut Pasteur in France, which first identified the outbreak last March, are investigating whether it could have become more contagious. Read more
Growing concerns over 'in the air' transmission of Ebola
Canadian scientists have shown that the deadliest form of the ebola virus could be transmitted by air between species. In experiments, they demonstrated that the virus was transmitted from pigs to monkeys without any direct contact between them. Read more