Scientists are trying to develop a vaccine against Ebola
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No one really knows if the drug given to two American aid workers really helped or whether now, back in the US, they are improving simply because they're getting the best medical care money can buy.
The World Health Organisation's discussions on whether to support further use of the experimental drug will be difficult.
Deciding against risks the accusation that a potentially life-saving treatment is available only to aid workers from wealthy countries.
Deciding in favour might, if the drug were to have major side effects, lead to charges the world's top public health body approved harmful medical experiments on some of the world's poorest people.
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getting better
does something even though something bad or dangerous could happen
a claim that someone has done something bad or wrong
possibly
effects of a drug or medicine that are not intended and can be unpleasant
causing injury
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