To the Editor: Hospitalisation rates for seasonal influenza are highest among young children and people aged over 65 years.1-3 Calculation of laboratory-confirmed infection rates is difficult because influenza testing is not consistently performed. Using diagnostic codes to identify hospitalisations for acute respiratory illness provides one measure of the relative burden of pandemic (H1N1) 2009 (pH1N1) virus infection compared with influenza virus infections in previous influenza seasons.
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- 1 Influenza Division, Centers for Disease Control and Prevention, Atlanta, Ga, USA.
- 2 Hunter New England Population Health, Newcastle, NSW.
- 1. Mullooly JP, Bridges CB, Thompson WW, et al. Influenza- and RSV-associated hospitalizations among adults. Vaccine 2007; 25: 846-855.
- 2. Poehling K, Edwards K, Weinberg G, et al. The underrecognized burden of influenza in young children. N Engl J Med 2006; 355: 31-40.
- 3. Simonsen L, Fukuda K, Schonberger LB, Cox NJ. The impact of influenza epidemics on hospitalizations. J Infect Dis 2000; 181: 831-837.
- 4. NSW Health. H1N1 influenza 09: this winter flu season. (Follow link to weekly influenza epidemiology report.) http://www.emergency.health.nsw. gov.au/swineflu/index.asp (accessed Aug 2009).
- 5. Australian Department of Health and Ageing. Australian influenza surveillance report. No. 11. 2009. http://www.healthemergency.gov.au/internet/healthemergency/publishing.nsf/Content/18D06BAC4644C98 DCA25763E00823442/$File/ozflu-no11-2009.pdf (accessed Sep 2009).