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Based on the previous text, judge the following items.

Even though the vaccines could be tested, the results may not be useful to assess their efficacy.
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Based on the previous text, judge the following items.

The West region of Africa is totally free from the Ebola virus.
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Based on the previous text, judge the following items.

The WHO mentioned has no intention of keeping biological material related to the disease.
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Based on the previous text, judge the following items.

The world had never witnessed an ebola epidemic of such magnitude as the one mentioned in the text.
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Based on the previous text, judge the following items.

The word 'robust' (R.15) can be correctly replaced by effective without this bringing any change of meaning to the sentence.