[Biological evaluation of Cuban plants. II]

The study of the antimicrobial activity of aqueous, alcoholic and ketonic extracts from different parts of five superior, dried, grinded and defatted plants of the families Myrtaceae, Polypodiaceae and Zingiberaceae is pursued. Good results were obtained from Psidium guajaba leave and stem ketonic extracts as well as from Costus spicatus leave and root alcoholic extracts.