F. Dawood, S. Jain, L. Finelli, M. Shaw, and S. Lindstrom, Emergence of a novel swine-origin influenza A (H1N1) virus in humans, N Engl J Med, vol.360, pp.2605-2615, 2009.

B. Cowling, M. Lau, L. Ho, S. Chuang, and T. Tsang, The Effective Reproduction Number of Pandemic Influenza, Epidemiology, vol.21, issue.6, pp.842-846, 2010.
DOI : 10.1097/EDE.0b013e3181f20977

W. Seto, B. Cowling, H. Lam, P. Ching, and M. To, Clinical and Nonclinical Health Care Workers Faced a Similar Risk of Acquiring 2009 Pandemic H1N1 Infection, Clinical Infectious Diseases, vol.53, issue.3, pp.280-283, 2009.
DOI : 10.1093/cid/cir375

Y. Zhou, D. Ng, W. Seto, D. Ip, and H. Kwok, Seroprevalence of antibody to pandemic influenza A (H1N1) 2009 among healthcare workers after the first wave in Hong Kong, Journal of Hospital Infection, vol.78, issue.4, pp.308-311, 2011.
DOI : 10.1016/j.jhin.2011.02.017

M. Greenberg, M. Lai, G. Hartel, C. Wichems, and C. Gittleson, Response to a Monovalent 2009 Influenza A (H1N1) Vaccine, New England Journal of Medicine, vol.361, issue.25, pp.2405-2413, 2009.
DOI : 10.1056/NEJMoa0907413

F. Zhu, H. Wang, H. Fang, Y. J. Lin, and X. , A Novel Influenza A (H1N1) Vaccine in Various Age Groups, New England Journal of Medicine, vol.361, issue.25, pp.2414-2423, 2009.
DOI : 10.1056/NEJMoa0908535

T. Clark, M. Pareek, K. Hoschler, H. Dillon, and K. Nicholson, Trial of 2009 Influenza A (H1N1) Monovalent MF59-Adjuvanted Vaccine, New England Journal of Medicine, vol.361, issue.25, pp.2424-2435, 2009.
DOI : 10.1056/NEJMoa0907650

X. Liang, H. Wang, J. Wang, H. Fang, and J. Wu, Safety and immunogenicity of 2009 pandemic influenza A H1N1 vaccines in China: a multicentre, double-blind, randomised, placebo-controlled trial, The Lancet, vol.375, issue.9708, pp.56-66, 2009.
DOI : 10.1016/S0140-6736(09)62003-1

Z. Vajo, F. Tamas, L. Sinka, and I. Jankovics, Safety and immunogenicity of a 2009 pandemic influenza A H1N1 vaccine when administered alone or simultaneously with the seasonal influenza vaccine for the 2009???10 influenza season: a multicentre, randomised controlled trial, The Lancet, vol.375, issue.9708, pp.49-55, 2009.
DOI : 10.1016/S0140-6736(09)62039-0

E. Plennevaux, E. Sheldon, M. Blatter, M. Reeves-hoche, and M. Denis, Immune response after a single vaccination against 2009 influenza A H1N1 in USA: a preliminary report of two randomised controlled phase 2 trials, The Lancet, vol.375, issue.9708, pp.41-48, 2009.
DOI : 10.1016/S0140-6736(09)62026-2

Q. Liao, B. Cowling, W. Lam, and R. Fielding, Factors Affecting Intention to Receive and Self-Reported Receipt of 2009 Pandemic (H1N1) Vaccine in Hong Kong: A Longitudinal Study, PLoS ONE, vol.112, issue.3, p.17713, 2011.
DOI : 10.1371/journal.pone.0017713.t003

J. Wu, E. Ma, and C. Lee, The Infection Attack Rate and Severity of 2009 Pandemic H1N1 Influenza in Hong Kong, Clinical Infectious Diseases, vol.51, issue.10, pp.1184-1191, 2010.
DOI : 10.1086/656740

B. Cowling, K. Chan, V. Fang, L. Lau, and H. So, Comparative Epidemiology of Pandemic and Seasonal Influenza A in Households, New England Journal of Medicine, vol.362, issue.23, pp.2175-2184, 2010.
DOI : 10.1056/NEJMoa0911530
URL : https://hal.archives-ouvertes.fr/pasteur-00588909

J. Sterne, I. White, J. Carlin, M. Spratt, and P. Royston, Multiple imputation for missing data in epidemiological and clinical research: potential and pitfalls, BMJ, vol.338, issue.jun29 1, p.2393, 2009.
DOI : 10.1136/bmj.b2393

S. Ng, P. Wu, H. Nishiura, D. Ip, and E. Lee, An analysis of national target groups for monovalent 2009 pandemic influenza vaccine and trivalent seasonal influenza vaccines in, BMC Infect Dis, vol.10, issue.11, pp.2010-2021, 2009.

G. Poland, P. Tosh, and R. Jacobson, Requiring influenza vaccination for health care workers: seven truths we must accept, Vaccine, vol.23, issue.17-18, pp.2251-2255, 2005.
DOI : 10.1016/j.vaccine.2005.01.043

H. Maltezou, A. Maragos, P. Katerelos, A. Paisi, and K. Karageorgou, Influenza vaccination acceptance among health-care workers: A nationwide survey, Vaccine, vol.26, issue.11, pp.1408-1410, 2008.
DOI : 10.1016/j.vaccine.2008.01.049

A. Bull, N. Bennett, H. Pitcher, P. Russo, and M. Richards, Influenza vaccine coverage among health care workers in Victorian public hospitals, Med J Aust, vol.186, pp.185-186, 2007.

F. Walker, J. Singleton, P. Lu, K. Wooten, and R. Strikas, Conclusions., Infection Control & Hospital Epidemiology, vol.131, issue.03, pp.257-265, 1989.
DOI : 10.2105/AJPH.77.6.712

J. De-juanes, G. De-codes, A. Arrazola, M. Jaen, F. Sanz et al., Influenza vaccination coverage among hospital personnel over three consecutive vaccination campaigns (2001???2002 to 2003???2004), Vaccine, vol.25, issue.1, pp.201-204, 2001.
DOI : 10.1016/j.vaccine.2005.10.057

J. Song, C. Park, H. Jeong, H. Cheong, and W. Kim, Conclusion., Infection Control & Hospital Epidemiology, vol.132, issue.06, pp.612-617, 2006.
DOI : 10.1093/infdis/151.6.1170

A. Shroufi, J. Copping, P. Musonda, R. Vivancos, and V. Langden, Influenza vaccine uptake among staff in care homes in Nottinghamshire: A random cluster sample survey, Public Health, vol.123, issue.10, pp.645-649, 2009.
DOI : 10.1016/j.puhe.2009.09.014

D. Isaacs and J. Leask, Should influenza immunisation be mandatory for healthcare workers? No, BMJ, vol.337, issue.oct28 3, p.2140, 2008.
DOI : 10.1136/bmj.a2140

J. Tilburt, P. Mueller, A. Ottenberg, G. Poland, and B. Koenig, Facing the challenges of influenza in healthcare settings: The ethical rationale for mandatory seasonal influenza vaccination and its implications for future pandemics, Vaccine, vol.26, pp.27-30, 2008.
DOI : 10.1016/j.vaccine.2008.07.068

C. Helms and P. Polgreen, Should influenza immunisation be mandatory for healthcare workers? Yes, BMJ, vol.337, issue.oct28 3, p.2142, 2008.
DOI : 10.1136/bmj.a2142

R. Al-khayatt, R. Jennings, and C. Potter, Summary, Journal of Hygiene, vol.52, issue.02, pp.301-312, 1984.
DOI : 10.1017/S0022172400070170

D. Van-der-vliet, S. Pepin, M. Lambert, N. Fauchoux, and Y. Donazzolo, Similar immunogenicity of the A/H1N1 2009 pandemic influenza strain when used as a monovalent or a trivalent vaccine, Human Vaccines, vol.6, issue.10, pp.34-39, 2010.
DOI : 10.4161/hv.6.10.13600

H. Igari, S. Segawa, A. Watanabe, A. Suzuki, and M. Watanabe, Immunogenicity of a monovalent pandemic influenza A H1N1 vaccine in health care workers of a university hospital in Japan, Microbiol Immunol, vol.54, pp.618-624, 2010.

I. Hung, K. To, C. Lee, C. Lin, and J. Chan, Effect of Clinical and Virological Parameters on the Level of Neutralizing Antibody against Pandemic Influenza A Virus H1N1 2009, Clinical Infectious Diseases, vol.51, issue.3, pp.274-279, 2009.
DOI : 10.1086/653940

S. Ohfuji, W. Fukushima, M. Deguchi, K. Kawabata, and H. Yoshida, Immunogenicity of a Monovalent 2009 Influenza A (H1N1) Vaccine Among Pregnant Women: Lowered Antibody Response by Prior Seasonal Vaccination, Journal of Infectious Diseases, vol.203, issue.9, p.1301, 2011.
DOI : 10.1093/infdis/jir026

T. Nolan, J. Mcvernon, M. Skeljo, R. P. Wadia, and U. , Immunogenicity of a Monovalent 2009 Influenza A(H1N1) Vaccine in Infants and Children, JAMA, vol.303, issue.1, pp.37-46, 2010.
DOI : 10.1001/jama.2009.1911

Y. Choi, Y. Baek, W. Kang, S. Nam, and J. Lee, Reduced Antibody Responses to the Pandemic (H1N1) 2009 Vaccine after Recent Seasonal Influenza Vaccination, Clinical and Vaccine Immunology, vol.18, issue.9, pp.1519-1523, 2011.
DOI : 10.1128/CVI.05053-11

S. Uno, K. Kimachi, J. Kei, K. Miyazaki, and A. Oohama, Effect of prior vaccination with a seasonal trivalent influenza vaccine on the antibody response to the influenza pandemic H1N1 2009 vaccine: a randomized controlled trial, Microbiology and Immunology, vol.375, issue.11, 2011.
DOI : 10.1111/j.1348-0421.2011.00381.x

J. Wu, X. Zhong, C. Li, J. Zhou, and M. Lu, Optimal vaccination strategies for 2009 pandemic H1N1 and seasonal influenza vaccines in humans, Vaccine, vol.29, issue.5, pp.1009-1016, 2011.
DOI : 10.1016/j.vaccine.2010.11.058

P. Gross, S. Sperber, A. Donabedian, S. Dran, and G. Morchel, Paradoxical response to a novel influenza virus vaccine strain: the effect of prior immunization, Vaccine, vol.17, issue.18, pp.2284-2289, 1999.
DOI : 10.1016/S0264-410X(98)00478-2

F. Roman, T. Vaman, F. Kafeja, E. Hanon, and P. Van-damme, ???Adjuvanted Influenza A (H1N1) 2009 Vaccine for Adults up to 85 Years of Age, Clinical Infectious Diseases, vol.51, issue.6, pp.668-677, 2010.
DOI : 10.1086/655830

T. Nolan, P. Richmond, N. Formica, K. Höschler, and M. Skeljo, Safety and immunogenicity of a prototype adjuvanted inactivated split-virus influenza A (H5N1) vaccine in infants and children, Vaccine, vol.26, issue.50, pp.6383-6391, 2008.
DOI : 10.1016/j.vaccine.2008.08.046

D. Smith, S. Forrest, D. Ackley, and A. Perelson, Variable efficacy of repeated annual influenza vaccination, Proceedings of the National Academy of Sciences, vol.96, issue.24, pp.14001-14006, 1999.
DOI : 10.1073/pnas.96.24.14001
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC24180

A. Iorio, B. Camilloni, M. Basileo, M. Neri, and E. Lepri, Effects of Repeated Annual Influenza Vaccination on Antibody Responses against Unchanged Vaccine Antigens in Elderly Frail Institutionalized Volunteers, Gerontology, vol.53, issue.6, pp.411-418, 2007.
DOI : 10.1159/000110579

P. Hardelid, N. Andrews, K. Hoschler, E. Stanford, and M. Baguelin, Assessment of baseline age-specific antibody prevalence and incidence of infection to novel influenza A/H1N1, Health Technology Assessment, vol.14, pp.115-192, 2010.

K. Chan, K. To, I. Hung, A. Zhang, and J. Chan, Differences in Antibody Responses of Individuals with Natural Infection and Those Vaccinated against Pandemic H1N1 2009 Influenza, Clinical and Vaccine Immunology, vol.18, issue.5, p.867, 2009.
DOI : 10.1128/CVI.00555-10

L. Brydak, M. Macha-a, M. Liwska, J. , M. Liwski et al., Immune response to influenza vaccination in an elderly population, Journal of Clinical Immunology, vol.23, issue.3, pp.214-222, 2003.
DOI : 10.1023/A:1023314029788

W. Künzel, H. Glathe, H. Engelmann, and C. Van-hoecke, Kinetics of humoral antibody response to trivalent inactivated split influenza vaccine in subjects previously vaccinated or vaccinated for the first time, Vaccine, vol.14, issue.12, pp.1108-1110, 1996.
DOI : 10.1016/0264-410X(96)00061-8

W. Liu, S. De-vlas, F. Tang, M. Ma, and M. Wei, Clinical and Immunological Characteristics of Patients with 2009 Pandemic Influenza A (H1N1) Virus Infection after Vaccination, Clinical Infectious Diseases, vol.51, issue.9, p.1028, 2010.
DOI : 10.1086/656588