2.Nicoll, A et al. (2010) Experience and lessons from surveillance and studies of the 2009 pandemic in Europe. Public Health 124, 14–23.
4.Stoto, MA (2012) The effectiveness of U.S. Public Health Surveillance Systems for situational awareness during the 2009 H1N1 pandemic: a retrospective analysis. PLoS ONE 7, e40984.
5.Rutter, P et al. (2014) Access to the NHS by telephone and Internet during an influenza pandemic: an observational study. BMJ Open 4, e004174.
6.Centers for Disease Control and Prevention (CDC) (2009) Outbreak of swine-origin influenza A (H1N1) virus infection – Mexico, March – April 2009. MMWR Morbidity Mortality Weekly Report 58(dispatch), 1–3.
7.Novel Swine-Origin Influenza A (H1N1) Virus Investigation Team (2009) Emergence of a novel swine-origin influenza A (H1N1) virus in humans. New England Journal of Medicine 360, 2605–2615.
8.Swerdlow, DL, Finelli, L and Bridges, CB (2011) 2009 H1N1 influenza pandemic: field and epidemiologic investigations in the United States at the start of the first pandemic of the 21st century. Clinical Infectious Disease 52(Suppl 1), S1–S3.
9.Garske, T et al. (2009) Assessing the severity of the novel influenza A/H1N1 pandemic. British Medical Journal 339, b2840.
10.Laurie, K et al. (2013) Influenza serological studies to inform public health actions: best practices to optimize timing, quality and reporting. Influenza and Other Respiratory Viruses 7, 211–224.
11.Department of Health (2010) Pandemic Influenza Preparedness Programme. Chief Medical Officer's Statistical Legacy Group.
12.Monto, AS (1994) Studies of the community and family: acute respiratory illness and infection. Epidemiological Reviews 16, 351–373.
13.Adler, AJ et al. (2014) Incidence and risk factors for influenza-like-illness in the UK: online surveillance using Flusurvey. BMC Infectious Diseases 14, 232.
14.Hardelid, P et al. (2010) Assessment of baseline age-specific antibody prevalence and incidence of infection to novel influenza A/H1N1 2009. Health Technology Assessment 14, 115–192.
15.Hayward, AC et al. (2014) Comparative community burden and severity of seasonal and pandemic influenza: results of the Flu Watch cohort study. Lancet Respiratory Medicine 2, 445–454.
16.Payne, L et al. (2005) ‘Did you have flu last week?’ A telephone survey to estimate a point prevalence of influenza in the Swedish population. Euro Surveillance 10, 241–244.
17.Malone, JL, Madjid, M and Casscells, SW (2008) Telephone survey to assess influenza-like illness, United States, 2006. Emerging Infectious Diseases 14, 129–135.
18.Rubin, J et al. (2009) Public perceptions, anxiety, and behaviour change in relation to the swine flu outbreak: cross sectional telephone survey. British Medical Journal 339, b2651.
19.Sedgewick, P (2012) Proportional quota sampling. British Medical Journal 345, e6336.
24.Gates, P et al. (2009) Collection of routine national seasonal influenza vaccine coverage data from GP practices in England using a web-based collection system. Vaccine 27, 6669–6677.
26.Vallance, JK et al. (2014) Utility of telephone survey methods in population-based health studies of older adults: an example from the Alberta Older Adult Health Behaviour (ALERT) study. BMC Public Health 14, 486.
27.Böhmer, MM et al. (2012) Barriers to pandemic influenza vaccination and uptake of seasonal influenza vaccine in the post-pandemic season in Germany. BMC Public Health 12, 938.
28.Vaux, S et al. (2011) Influenza vaccination coverage against seasonal and pandemic influenza and their determinants in France: a cross-sectional survey. BMC Public Health 11, 30.
29.Müller, D, Nguyen-Van-Tam, JS and Szucs, TD (2006) Influenza vaccination coverage rates in the UK: a comparison of two monitoring methods during the 2002–2003 and 2003–2004 seasons. Public Health 120, 1074–1080.
30.Van Kerkhove, MD et al. HO informal network for mathematical modelling for pandemic influenza H1N1 2009 (Working Group on Data Needs) (2010) Studies needed to address public health challenges of the 2009 H1N1 influenza pandemic: insights from modeling. PLoS Medicine 7, e1000275.