Key points: - a decrease in incidence in 2001 and stable incidence from 2001 to 2003; - investigation of three clusters of cases linked to the consumption of processed meat products: tartiflette (May 2002), head cheese (August 2002), and mortadella (January 2003); - improvement of the surveillance system through systematic investigations of cases of neuro-meningeal listeriosis. (R.A.)