Objective: Legionnaire's disease complicating pregnancy is an unusual event that can seriously compromise both the mother and the fetus.
Case report: We describe one case of such association, with an unfavourable intrauterine fetal outcome, secondary to acute placental insufficiency, related to infection.
Discussion: It is important in these high risk pregnancies complicated by acute pneumonia to take into consideration the diagnosis, as early as possible, and the appropriate treatment or the careful monitoring of fetal wellbeing.