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Even though the vaccines could be tested, the results may not be useful to assess their efficacy.
The West region of Africa is totally free from the Ebola virus.
The WHO mentioned has no intention of keeping biological material related to the disease.
The world had never witnessed an ebola epidemic of such magnitude as the one mentioned in the text.
The word 'robust' (R.15) can be correctly replaced by effective without this bringing any change of meaning to the sentence.