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Abstract Background Research into risk perception and behavioural responses in case of emerging infectious diseases is still relatively new. The aim of this study was to examine perceptions and behaviours of the general public during the early phase of the Influenza A (H1N1) pandemic in the Netherlands. Methods Two cross-sectional and one follow-up online survey (survey 1, 30 April-4 May; survey 2, 15-19 June; survey 3, 11-20 August 2009). Adults aged 18 years and above participating in a representative Internet panel were invited (survey 1, n = 456; survey 2, n = 478; follow-up survey 3, n = 934). Main outcome measures were 1) time trends in risk perception, feelings of anxiety, and behavioural responses (survey 1-3) and 2) factors associated with taking preventive measures and strong intention to comply with government-advised preventive measures in the future (survey 3). Results Between May and August 2009, the level of knowledge regarding Influenza A (H1N1) increased, while perceived severity of the new flu, perceived self-efficacy, and intention to comply with preventive measures decreased. The perceived reliability of information from the government decreased from May to August (62% versus 45%). Feelings of anxiety decreased from May to June, and remained stable afterwards. From June to August 2009, perceived vulnerability increased and more respondents took preventive measures (14% versus 38%). Taking preventive measures was associated with no children in the household, high anxiety, high self-efficacy, more agreement with statements on avoidance, and paying much attention to media information regarding Influenza A (H1N1). Having a strong intention to comply with government-advised preventive measures in the future was associated with higher age, high perceived severity, high anxiety, high perceived efficacy of measures, high self-efficacy, and finding governmental information to be reliable. Conclusions Decreasing trends over time in perceived severity and anxiety are consistent with the reality: the clinical picture of influenza turned out to be mild in course of time. Although (inter)national health authorities initially overestimated the case fatality rate, the public stayed calm and remained to have a relatively high intention to comply with preventive measures.

Acknowledgements This research was supported by the Health Foundation Improvement Science Award (grant number: GIFTS ID 7223 awarded to SP). JMG holds a Canada Research Chair in Health Knowledge Transfer and Uptake. DK's work is carried out within the HOMING program of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund; grant number POIR.04.04.00-00-5CF3/18-00; HOMING 5/2018. We would also like to thank Lauren Basey for optimising the design of our included figure. ; Peer reviewed ; Publisher PDF

Funding Information: This research was supported by the Health Foundation Improvement Science Award (grant number: GIFTS ID 7223 awarded to Sebastian Potthoff). Tracy Finch, Tim Rapley, Sebastian Potthoff, Tom Saunders and Luke Vale are members of the NIHR Applied Research Collaboration North East and North Cumbria ( NIHR200173 ). Luke Vale is also a member of the NIHR Newcastle In Vitro Diagnostics Co-operative, NIHR School for Public Health Research, and Fuse, the Centre for Translational Research in Public Health . The views expressed are those of the author(s) and not necessarily those of the NIHR or the Department of Health and Social Care . Jeremy M. Grimshaw holds a Canada Research Chair in Health Knowledge Transfer and Uptake. Dominika Kwasnicka's work is carried out within the HOMING program of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund ; grant number POIR.04.04.00-00-5CF3/18-00 ; HOMING 5/2018. We would also like to thank Lauren Basey for optimising the design of our included figure. Funding Information: This research was supported by the Health Foundation Improvement Science Award (grant number: GIFTS ID 7223 awarded to Sebastian Potthoff). Tracy Finch, Tim Rapley, Sebastian Potthoff, Tom Saunders and Luke Vale are members of the NIHR Applied Research Collaboration North East and North Cumbria (NIHR200173). Luke Vale is also a member of the NIHR Newcastle In Vitro Diagnostics Co-operative, NIHR School for Public Health Research, and Fuse, the Centre for Translational Research in Public Health. The views expressed are those of the author(s) and not necessarily those of the NIHR or the Department of Health and Social Care. Jeremy M. Grimshaw holds a Canada Research Chair in Health Knowledge Transfer and Uptake. Dominika Kwasnicka's work is carried out within the HOMING program of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund; grant number POIR.04.04.00-00-5CF3/18-00; ...