Potential for early warning of viral influenza activity in the community by monitoring clinical diagnoses of influenza in hospital emergency departments
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Cites background or methods from "Potential for early warning of vira..."
...The most frequently used data were chief complaint or ED presentation [9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41] and preliminary or discharge diagnosis codes [8,9,11,16,17,18,22,23,26,27,32,33,38,39,41,42]....
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...The observed syndromic cases based on ED data were in some cases linked to objective, confirmatory data, such as culture and other laboratory results, [8,10,11,12,14,15,16,17,18,19,20,21,24,25,27,30,31,32,33,34,35,37,41] and in some cases to traditional regional and national surveillance databases [9,13,16,17,22,25,26,27,29,40,43], historic data [44] and pneumonia and influenza weekly mortality data [12,14]....
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"Potential for early warning of vira..." refers background in this paper
...This technique is likely to miss the effect of influenza because the timing and severity of seasonal influenza epidemics are marked by excess pneumonia and influenza mortality over and above the seasonal background [40-42]....
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