title: Surveillance is action!
abstract: Surveillance must lead to action: such is its philosophy and its public health justification. This statement is perfectly illustrated by the surveillance of legionellosis. The disease is transmitted by contaminated aerosols from a waterborne germ reservoi
authors.affiliation: Institut de Veille Sanitaire, Saint-Maurice, France.
authors.forename: J-C.
authors.initials: JC
authors.lastname: Desenclos