Influenza in the immediate post-pandemic era: A comparison with seasonal and pandemic influenza in hospitalized patients

JC Rahamat-Langendoen, ED Tutuhatunewa, EH Scholvinck, E Hak, Marion Koopmans, HGM Niesters, A Riezebos-Brilman

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)


Background: Comparative data on severity and treatment of seasonal, pandemic and post-pandemic influenza virus infections are scarce. Objectives: To systematically analyze characteristics of hospitalized patients with influenza in the post-pandemic period compared to seasonal and pandemic influenza. Study design: Clinical and virological data of patients hospitalized in a tertiary referral hospital with post-pandemic influenza (2010-2011) were compared with those during seasonal influenza epidemics (2007-2009) and the influenza A(H1N1)pdm09 pandemic (2009-2010). Results: 82 patients were admitted during the post-pandemic period, compared to 85 during the pandemic and 60 during seasonal influenza epidemics. No differences were observed in the occurrence of complicated illness and the need for intensive care. However, radiographic pneumonia was significantly more often diagnosed in patients with influenza A(H1N1) pdm09 compared to patients with seasonal influenza A (25% versus 71% in pandemic, p = 0.004, and 55% in post-pandemic, p = 0.047). Oseltamivir w Conclusions: In our center, severity of illness was comparable for all influenza seasons, although more radiographic pneumonia was diagnosed in patients with influenza A(H1N1) pdm09. Despite the increased use of oseltamivir, no increase in oseltamivir resistance was detected. (C) 2012 Elsevier B.V. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)135-140
Number of pages6
JournalJournal of Clinical Virology
Issue number2
Publication statusPublished - 2012

Research programs

  • EMC MM-04-27-01

Cite this