One shot or two? Many questions unresolved in Ebola vaccine race

By Ben Hirschler and Kate Kelland LONDON (Reuters) - Scientists racing to develop vaccines against Ebola are trying to determine whether they can best fight the disease with a single injection or with two, a calculation that could determine how quickly and effectively a program can be rolled out. Administering two vaccines, one after the other, would almost certainly give far greater protection than a single shot against a deadly virus that has killed more than 6,000 people in West Africa this year. ...



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