This study compares the frequency and severity of influenza A/H1N1pdm09 (A/H1),
influenza A/H3N2 (A/H3) and other respiratory virus infections in hospitalised patients. Data …

Background Data from prospectively planned cohort studies on risk of major clinical
outcomes and prognostic factors for patients with influenza A (H1N1) pdm09 virus are …

Abstract Background After pandemic, A (H1N1) pdm09 is generally known to be associated
with younger adults' infection and greater severity than seasonal A (H3N2) but some …

We studied risk factors for a severe clinical outcome in hospitalized patients with laboratory-
confirmed influenza A (H1N1) pdm09 infection at the University Hospital Heidelberg in the …

During the 2009 influenza pandemic, uncertainty surrounding the severity of human
infections with the influenza A (H1N1) pdm09 virus hindered the calibration of the early …

Background Influenza burden varies across seasons, partly due to differences in circulating
influenza virus types or subtypes. Using data from the US population-based surveillance …

It is important to characterize the clinical and epidemiological pattern of the influenza A
(H1N1) pdm09 virus and compare it with influenza A (H3N2) virus, as surveyed in just a few …

Background. Persons with influenza can develop complications that result in hospitalization
and death. These are most commonly respiratory related, but cardiovascular or neurologic …

Background Recent pandemics of influenza A H1N1pdm09 virus have caused severe
illness, especially in young people. Very few studies on influenza A H1N1pdm09 in post …

Background. It is unclear whether pandemic 2009 influenza A (pH1N1) infection caused
more significant disease among hospitalized adults than seasonal influenza. Methods. A …