Tales of runny noses and fever on Twitter do not offer a reliable way to track disease, he argues, as there is no way of testing their accuracy.
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The accuracy of testing depends on the disease.
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Regular system and staff testing and preparation procedures are followed including system testing for effectiveness and data accuracy.
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Concerns also emerged last year about the accuracy of nuclear reactor monitoring instruments during testing.
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"One of the wonderful aspects of our improved testing is that we can describe both strong and weak signals with incredible accuracy, " Boeing spokesman Adam Tischler said in a statement to CNN.
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