Diagnostic Importance of Relative Lymphopenia as a Marker of Swine Influenza (H1N1) in Adults

Abstract
To the Editor—Unlike severe influenza A, which has characteristic findings, mild or moderate influenza A is clinically indistinguishable from influenza-like illness [1, 2]. Early in the swine influenza (H1N1) pandemic (April and May 2009), our emergency department was inundated with 856 patient requests for rapid influenza A testing and/or evaluation.

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