Nichols said the ban was not prompted by any specific threat, but is a preventative measure.
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But it says the calls to specific customers are being made as a "preventative measure".
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Many dream that an effective vaccine could also be administered after HIV infection as a treatment, not a preventative measure.
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And another kind of preventative measure that would stop people taking drugs if they thought they were going to be caught out.
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The disease has spread from eastern China both northward and southward, leading to the closure of a growing number of markets where live chicken is sold as a preventative measure.
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