'I trust them because my mum trusts them': Exploring the role of trust in HPV vaccination decision-making among adolescent girls and their mothers in France.

The success of vaccination programmes relies on high uptake and acceptance of vaccines, which is in part influenced by public trust in vaccines, providers, policy-makers and information. France is one of the countries in the world with the lowest confidence in vaccination, with parents expressing particular concerns about the human papillomavirus (HPV) vaccine. This qualitative study explored the role of trust in HPV vaccination decision-making among mothers and adolescent girls in France. Semi-structured interviews and focus groups were conducted with 15-16-year-old adolescent girls and their mothers in Paris. A thematic analysis based on deductive and inductive coding was conducted. HPV vaccination decision-making was described as a complex and uncertain process, a possible consequence of erosion of trust in the vaccine, in healthcare professionals and health authorities, and in information itself. Due to public criticism of the vaccine and conflicting advice received from medical professionals, the vaccine was perceived as controversial. The mothers' strong trust in doctors did not always increase HPV vaccine acceptance, as doctors themselves failed to recommend or recommended against the vaccine. Furthermore, the perceived mismanagement of previous health events tainted the mothers' trust in health authorities. Contrastingly, while adolescents expressed trust in doctors and health authorities, their trust in their own mothers was stronger. A lack of exposure to positive sources of information (e.g. from doctors, schools or media) contributed to low awareness about HPV vaccination among adolescent girls. While both mothers and girls discussed the importance of trusting themselves, they also acknowledged being influenced by others around them as well as information, often negative, from the internet. Adolescent girls also expressed mistrust about information in general, explaining that any information can be manipulated. Low confidence in HPV vaccination in France can be explained by broader trust issues, which will require long-term efforts to address.