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Epidemiol Infect. 2013 Apr;141(4):767-75. doi: 10.1017/S0950268812001471. Epub 2012 Jul 16.

Burden and characteristics of influenza A and B in Danish intensive care units during the 2009/10 and 2010/11 influenza seasons.

Author information

1
European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control, Artillerivej 5, Stockholm, Sweden. gub@ssi.dk

Abstract

Influenza surveillance in Danish intensive care units (ICUs) was performed during the 2009/10 and 2010/11 influenza seasons to monitor the burden on ICUs. All 44 Danish ICUs reported aggregate data for incidence and point prevalence, and case-based demographical and clinical parameters. Additional data on microbiological testing, vaccination and death were obtained from national registers. Ninety-six patients with influenza A(H1N1)pdm09 were recorded in 2009/10; 106 with influenza A and 42 with influenza B in 2010/11. The mean age of influenza A patients was higher in 2010/11 than in 2009/10, 53 vs. 44 years (P = 0·004). No differences in other demographic and clinical parameters were detected between influenza A and B patients. In conclusion, the number of patients with severe influenza was higher in Denmark during the 2010/11 than the 2009/10 season with a shift towards older age groups in influenza A patients. Influenza B caused severe illness and needs consideration in clinical and public health policy.

PMID:
22793496
DOI:
10.1017/S0950268812001471
[Indexed for MEDLINE]

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