The Authors report the results of the researches made in their Hospital, about the bacteriological control of some departments and services, and of the staff that works there. After pointing out the scanty presence of pathogeneus germs in their hospitalier place, they augur a constant and repeated prophylactic sanitary control, whether of the structures, or the hospitalier staff, to avoid the possibility of diffusion of these germs in persons, already predisposed, since suffering from the most various diseases.