A questionnaire study was performed to evaluate the effectiveness of a continuing medical education course on influenza vaccination, held in October 2011, in changing physicians', medical students' and other health care workers' attitudes towards receiving vaccination for seasonal influenza. The questionnaire contained questions regarding influenza, influenza vaccination, and attitudes towards vaccination. Results show that course participants were more likely to get vaccinated against seasonal influenza in 2011 (i.e. following the course) with respect to 2010 and that all professional categories, except students, were positively influenced by the course.