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Colonization, safety, and tolerability study of the Streptococcus salivarius 24SMBc nasal spray for its application in upper respiratory tract infections

  • M. SantagatiEmail author
  • M. Scillato
  • N. Muscaridola
  • V. Metoldo
  • I. La Mantia
  • S. Stefani
Original Article

Abstract

Streptococcus salivarius, a non-pathogenic species and the predominant colonizer of the oral microbiota, finds a wide application in the prevention of upper respiratory tract infections, also reducing the frequency of their main pathogens. In this pilot study, the primary objective was to evaluate the safety and tolerability of a nasal spray, S. salivarius 24SMBc, as a medical device in a clinical study involving 20 healthy adult subjects. The secondary aim was to determine the ability of colonization assessed by molecular fingerprinting. Twenty healthy adult subjects, aged between 30 and 54 years, without a medical history of recurrent otitis media, were enrolled. All patient characteristics fulfilled the inclusion criteria. All subjects were treated daily for 3 days with the nasal spray containing S. salivarius 24SMBc at a concentration of 5 × 109 colony-forming units (CFU)/ml. The persistence of S. salivarius in the nasopharynx was investigated by the antagonism test and random amplified polymorphic DNA polymerase chain reaction (RAPD-PCR). The tolerability and safety were clinically assessed by clinical examinations during treatment. Our results demonstrate the capability of S. salivarius 24SMBc to colonize the rhinopharynx tissues in 95 % of subjects and persist in 55 % of them after 6 days from the last dose of the formulation, maintaining a concentration of 105 CFU/ml. The treatment was well tolerated by all healthy patients and no adverse effects were found. The topical application of streptococcal probiotics is a relatively undeveloped field but is becoming an attractive approach for both prevention and therapy, especially for pediatric age patients. S. salivarius 24SMBc possess characteristics making this strain suitable for use in bacteriotherapy.

Keywords

Nasal Spray Moraxella Catarrhalis Oral Microbiota Recurrent Otitis Medium Molecular Fingerprinting 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study was supported by a project funded by the Italian Ministry of Education, University and Research (MIUR), PON_02589 and a research grant from DMG Italia. The nasal spray as a medical device was kindly provided by DMG Italia. We thank the Scientific Bureau of the University of Catania for the language support.

Conflict of interest

The authors declare that there is no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • M. Santagati
    • 1
    Email author
  • M. Scillato
    • 1
  • N. Muscaridola
    • 1
  • V. Metoldo
    • 1
  • I. La Mantia
    • 2
  • S. Stefani
    • 1
  1. 1.LabMMAR, Department of Biomedical and Biotechnological Sciences, Section of MicrobiologyUniversity of CataniaCataniaItaly
  2. 2.Department of Medical Sciences, Surgical and Advanced Technologies, GF IngrassiaUniversity of CataniaCataniaItaly

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