World Health Organization. Influenza (seasonal), Fact sheet. 2016. http://www.who.int/mediacentre/factsheets/fs211/en/. Accessed 15 May 2017.
Nicholson KG, Wood JM, Zambon M. Influenza. Lancet. 2003;362:1733–45.
Dyda A, Karki S, Hayen A, MacIntyre CR, Menzies R, Banks E, et al. Influenza and pneumococcal vaccination in Australian adults: a systematic review of coverage and factors associated with uptake. BMC Infect Dis. 2016;16:515.
Blank PR, Szucs TD. Increasing influenza vaccination coverage in recommended population groups in Europe. Expert Rev Vaccin. 2009;8:425–33.
World Health Organization. Obesity and Overweight, Fact sheet. 2016. http://www.who.int/mediacentre/factsheets/fs311/en/. Accessed 15 May 2017.
Australian Bureau of Statistics. National Health Survey, First Results, Australia 2014-2015. http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/4364.0.55.0012014-15?OpenDocument. Accessed 15 May 2017.
Flegal KM, Carroll MD, Kit BK, Ogden CL. Prevalence of obesity and trends in the distribution of body mass index among us adults, 1999-2010. JAMA. 2012;307:491–7.
Australian Government, Department of Health. The Australian Immunisation Handbook, 10th Edition. http://www.immunise.health.gov.au/internet/immunise/publishing.nsf/Content/7B28E87511E08905CA257D4D001DB1F8/$File/Aus-Imm-Handbook.pdf. Accessed 15 May 2017.
Martin V, Castilla J, Godoy P, Delgado-Rodriguez M, Soldevila N, Fernandez-Villa T, et al. High body mass index as a risk factor for hospitalization due to influenza: a case-control study. Arch Bronconeumol. 2016;52:299–307.
Centers for Disease C, Prevention. Intensive-care patients with severe novel influenza A (H1N1) virus infection - Michigan, June 2009. MMWR Morb Mortal Wkly Rep. 2009;58:749–52.
Sun Y, Wang Q, Yang G, Lin C, Zhang Y, Yang P. Weight and prognosis for influenza A(H1N1)pdm09 infection during the pandemic period between 2009 and 2011: a systematic review of observational studies with meta-analysis. Infect Dis. 2016;48:813–22.
Fezeu L, Julia C, Henegar A, Bitu J, Hu FB, Grobbee DE, et al. Obesity is associated with higher risk of intensive care unit admission and death in influenza A (H1N1) patients: a systematic review and meta-analysis. Obes Rev. 2011;12:653–9.
Louie JK, Acosta M, Samuel MC, Schechter R, Vugia DJ, Harriman K, et al. A novel risk factor for a novel virus: obesity and 2009 pandemic influenza A (H1N1). Clin Infect Dis. 2011;52:301–12.
Mertz D, Kim TH, Johnstone J, Lam PP, Science M, Kuster SP, et al. Populations at risk for severe or complicated influenza illness: systematic review and meta-analysis. BMJ. 2013;347:f5061.
Tempia S, Walaza S, Moyes J, Cohen AL, von Mollendorf C, Treurnicht FK, et al. Risk factors for influenza-associated severe acute respiratory illness hospitalization in South Africa, 2012-2015. Open Forum Infect Dis. 2017;4:ofw262.
Charland KM, Buckeridge DL, Hoen AG, Berry JG, Elixhauser A, Melton F, et al. Relationship between community prevalence of obesity and associated behavioral factors and community rates of influenza-related hospitalizations in the United States. Influenza Other Respir Virus. 2013;7:718–28.
Kwong JC, Campitelli MA, Rosella LC. Obesity and respiratory hospitalizations during influenza seasons in Ontario, Canada: a cohort study. Clin Infect Dis. 2011;53:413–21.
Dimitrijevic D, Ilic D, Rakic Adrovic S, Suljagic V, Pelemis M, Stevanovic G, et al. Predictors of hospitalization and admission to intensive care units of influenza patients in serbia through four influenza seasons from 2010/2011 to 2013/2014. Jpn J Infect Dis. 2017;70:275–83.
Zhou Y, Cowling BJ, Wu P, Chan WM, Lee SY, Lau EH, et al. Adiposity and influenza-associated respiratory mortality: a cohort study. Clin Infect Dis. 2015;60:e49–57.
Braun ES, Crawford FW, Desai MM, Meek J, Kirley PD, Miller L, et al. Obesity not associated with severity among hospitalized adults with seasonal influenza virus infection. Infection. 2015;43:569–75.
Blumentals WA, Nevitt A, Peng MM, Toovey S. Body mass index and the incidence of influenza-associated pneumonia in a UK primary care cohort. Influenza Other Respir Virus. 2012;6:28–36.
Cocoros NM, Lash TL, DeMaria A Jr, Klompas M. Obesity as a risk factor for severe influenza-like illness. Influenza Other Respir Virus. 2014;8:25–32.
Coleman LA, Waring SC, Irving SA, Vandermause M, Shay DK, Belongia EA. Evaluation of obesity as an independent risk factor for medically attended laboratory-confirmed influenza. Influenza Other Respir Virus. 2013;7:160–7.
Neidich SD, Green WD, Rebeles J, Karlsson EA, Schultz-Cherry S, Noah TL, et al. Increased risk of influenza among vaccinated adults who are obese. Int J Obes. 2017;41:1324–30.
45 and Up Study Collaborators, Banks E, Redman S, Jorm L, Armstrong B, Bauman A, et al. Cohort profile: the 45 up study. Int J Epidemiol. 2008;37:941–7.
Centre for Health Record Linkage (CHeReL): Quality assurance. http://www.cherel.org.au/media/24160/qa_report_2012.pdf. Accessed 14 May 2017.
Center for Health Record Linkage. Data dictionaries- Notifiable Conditions Information Management System (NCIMS). http://www.cherel.org.au/media/29612/ncims_data_dictionary_feb_2014-a.docx. Accessed 17 May 2017.
Center for Health Record Linkage. Data dictionaries- NSW Admitted Patient Data Collection (APDC). http://www.cherel.org.au/data-dictionaries#section1. Accessed 17 May 2017.
World Health Organization. Body Mass Index—BMI. 2017. http://www.euro.who.int/en/health-topics/disease-prevention/nutrition/a-healthy-lifestyle/body-mass-index-bmi. Accessed 18 May 2017.
Australian Institute of Health and Welfare. Rural, Regional and Remote Health: A Guide to Remoteness Classifications. Rural Health Series No. 4. AIHW Cat. No. PHE 53. AIHW, Canberra. 2004. http://www.aihw.gov.au/WorkArea/DownloadAsset.aspx?id=6442459567. Accessed 7 Aug 2017.
Green WD, Beck MA. Obesity impairs the adaptive immune response to influenza virus. Ann Am Thorac Soc. 2017;14:S406–S409.
Paich HA, Sheridan PA, Handy J, Karlsson EA, Schultz-Cherry S, Hudgens MG, et al. Overweight and obese adult humans have a defective cellular immune response to pandemic H1N1 influenza A virus. Obesity. 2013;21:2377–86.
Karlsson EA, Sheridan PA, Beck MA. Diet-induced obesity in mice reduces the maintenance of influenza-specific CD8+ memory T cells. J Nutr. 2010;140:1691–7.
Smith AG, Sheridan PA, Harp JB, Beck MA. Diet-induced obese mice have increased mortality and altered immune responses when infected with influenza virus. J Nutr. 2007;137:1236–43.
Painter SD, Ovsyannikova IG, Poland GA. The weight of obesity on the human immune response to vaccination. Vaccine. 2015;33:4422–9.
Peiris JS, Hui KP, Yen HL. Host response to influenza virus: protection versus immunopathology. Curr Opin Immunol. 2010;22:475–81.
Morgan OW, Bramley A, Fowlkes A, Freedman DS, Taylor TH, Gargiullo P, et al. Morbid obesity as a risk factor for hospitalization and death due to 2009 pandemic influenza A(H1N1) disease. PLoS ONE. 2010;5:e9694.
Van Kerkhove MD, Vandemaele KA, Shinde V, Jaramillo-Gutierrez G, Koukounari A, Donnelly CA, et al. Risk factors for severe outcomes following 2009 influenza A (H1N1) infection: a global pooled analysis. PLoS Med. 2011;8:e1001053.
Campitelli MA, Rosella LC, Kwong JC. The association between obesity and outpatient visits for acute respiratory infections in Ontario, Canada. Int J Obes. 2014;38:113–9.
Phung DT, Wang Z, Rutherford S, Huang C, Chu C. Body mass index and risk of pneumonia: a systematic review and meta-analysis. Obes Rev. 2013;14:839–57.
Flahault A, de Lamballerie X, Hanslik T. Symptomatic infections less frequent with H1N1pdm than with seasonal strains: Antoine Flahault, Xavier de Lamballerie, Camille Pelat, Nicolas Salez, Thomas Hanslik. PLoS Curr. 2009;1:RRN1140.
Leung NH, Xu C, Ip DK, Cowling BJ. Review article: the fraction of influenza virus infections that are asymptomatic: a systematic review and meta-analysis. Epidemiology. 2015;26:862–72.
Dyda A, MacIntyre CR, McIntyre P, Newall AT, Banks E, Kaldor J, et al. Factors associated with influenza vaccination in middle and older aged Australian adults according to eligibility for the national vaccination program. Vaccine. 2015;33:3299–305.
Ng SP, Korda R, Clements M, Latz I, Bauman A, Bambrick H, et al. Validity of self-reported height and weight and derived body mass index in middle-aged and elderly individuals in Australia. Aust N Z J Public Health. 2011;35:557–63.
Prospective Studies Collaboration. Body-mass index and cause-specific mortality in 900 000 adults: collaborative analyses of 57 prospective studies. Lancet. 2009;373:1083–96.
World Health Organization, 2017. Influenza, FluNet. http://apps.who.int/flumart/Default?ReportNo=12. Accessed 24 Jul 2017.
Lau D, Eurich DT, Majumdar SR, Katz A, Johnson JA. Working-age adults with diabetes experience greater susceptibility to seasonal influenza: a population-based cohort study. Diabetologia. 2014;57:690–8.