 2009 Influenza A, H1N1, Pandemic in the Netherlands. The study aimed to identify changes in public intentions and factors associated with them during the pandemic. 16 cross-sectional telephone surveys were conducted between April, November 2009, resulting in a total of 8,060 participants. Three consecutive periods were categorized based on crucial events during the pandemic. Time trends in government trust, risk perception, intention to adopt protective measures, and acceptance of vaccination were analyzed. Factors associated with an intention to adopt protective measures or vaccination were identified. The results showed that trust in the government was high but decreased over time. Perceived vulnerability and an intention to adopt protective measures increased during the course of the pandemic. Trust and vulnerability were associated with an intention to adopt protective measures only during period 1. Higher levels of intention to receive vaccination were associated with increased government trust, fear, worry, and perceived vulnerability. Risk and crisis communication by the government should focus on building and maintaining trust by providing information about preventing infection in close collaboration with municipal health services, healthcare providers, and the media. This article was offered by Outhoft-Jurian, Bogeen Desiree JMA, Timamins Danielle RM, and others. We are article.tv, links in the description below.