A composition for a medical device comprising a specific mucoadherent gelling complex composed of EPS, exopolysaccharides of bacterial origin produced in situ in the gastrointestinal tract by specific selected bacterial strains, in association with vegetable gums and/or vegetable gelatines, for use as a medication for the prevention and the treatment of pathologies connected to a deficiency in the barrier effect in the gastrointestinal area due to a low production of mucus selected from infections, such as infections by pathogenic bacteria, inflammations and disorders of the gastrointestinal tract and candidiasis, wherein: - said deficiency in the barrier effect in the gastrointestinal area due to a low production of mucus occurs in the case of intestinal permeability and of a bacterial translocation, - said exopolysaccharide-producing bacterial strains are selected from the group of bacteria belonging to the species Streptococcus thermophilus and are capable of producing exopolysaccharides in situ in the gastrointestinal tract to protect the intestinal mucosa from the action of pathogenic bacteria, wherein said bacteria of the Streptococcus thermophilus species are selected from the group comprising or, alternatively, consisting of: - Streptococcus thermophilus DSM 16590, deposited with the depositary institution DSMZ in Germany on 20.07.2004, - Streptococcus thermophilus DSM 16592, deposited with the depositary institution DSMZ in Germany on 20.07.2004, - Streptococcus thermophilus DSM 17843, deposited with the depositary institution DSMZ in Germany on 21.12.2005, - Streptococcus thermophilus DSM 25246, deposited with the depositary institution DSMZ in Germany on 19.09.2011, - Streptococcus thermophilus DSM 25247, deposited with the depositary institution DSMZ in Germany on 19.09.2011, - Streptococcus thermophilus DSM 25282, deposited with the depositary institution DSMZ in Germany on 19.09.2011, and - said vegetable gums and/or vegetable gelatines are selected from the group consisting of Aloe gelatine, Aloe vera gelatine or Aloe arborescens gelatine, or tara gum. - said deficiency in the barrier effect in the gastrointestinal area due to a low production of mucus occurs in the case of intestinal permeability and of a bacterial translocation, - said exopolysaccharide-producing bacterial strains are selected from the group of bacteria belonging to the species Streptococcus thermophilus and are capable of producing exopolysaccharides in situ in the gastrointestinal tract to protect the intestinal mucosa from the action of pathogenic bacteria, wherein said bacteria of the Streptococcus thermophilus species are selected from the group comprising or, alternatively, consisting of: - Streptococcus thermophilus DSM 16590, deposited with the depositary institution DSMZ in Germany on 20.07.2004, - Streptococcus thermophilus DSM 16592, deposited with the depositary institution DSMZ in Germany on 20.07.2004, - Streptococcus thermophilus DSM 17843, deposited with the depositary institution DSMZ in Germany on 21.12.2005, - Streptococcus thermophilus DSM 25246, deposited with the depositary institution DSMZ in Germany on 19.09.2011, - Streptococcus thermophilus DSM 25247, deposited with the depositary institution DSMZ in Germany on 19.09.2011, - Streptococcus thermophilus DSM 25282, deposited with the depositary institution DSMZ in Germany on 19.09.2011, and - said vegetable gums and/or vegetable gelatines are selected from the group consisting of Aloe gelatine, Aloe vera gelatine or Aloe arborescens gelatine, or tara gum.