The clinical spectrum of H1N1(2009) is still being defined in different populations and clinical settings the accuracy Previous reports of influenza have noted clinical dissimilarities in the observed presentation and course of influenza infection between various influenza subtypes This study provides comparative evidence that the initial presentation of novel H1N1(2009) in adults does not differ significantly from that of contemporary seasonal influenza—the majority (83 percent) of which were influenza A (H3N2) With the exception of lymphopenia Our findings on H1N1(2009) are both reassuring and mostly consistent with information published to date In our series however