Introduction. An awareness campaign promoting measles vaccination was launched in two departments of the Auvergne region in early 2011 through letters sent to parents of schoolchildren, in response to a measles outbreak. The objective of this study was to assess the impact of this campaign on vaccination coverage. Materials and Methods. Vaccine sales data from pharmacies provided by the Groupement pour l’élaboration et la réalisation de statistiques (GERS) were used for a study period spanning September 1, 2010, to June 30, 2011. The first indicator compared a post-campaign period with a pre-campaign period, each lasting four months; the second compared monthly sales, and the third compared sales variations between the Auvergne and Rhône-Alpes regions to control for the effect of the outbreak. Results. Increases in vaccine sales, significantly higher in the departments where the awareness campaign took place, were observed during the months following the campaign, regardless of the indicator used. Furthermore, the increase in sales occurred rapidly after the awareness campaign. Discussion and conclusion. Vaccine sales data from pharmacies provided by the Gers department suggest that the awareness campaign had a beneficial effect on vaccination coverage, based on the indicators used, even though it is not possible to precisely quantify the proportion attributable to this campaign. The lack of a breakdown by age group in the vaccine sales data constitutes the main limitation of this source. (R.A.)