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. 1981 Apr;32(1):311–317. doi: 10.1128/iai.32.1.311-317.1981

Adhesion of Streptococcus pneumoniae to human pharyngeal epithelial cells in vitro: differences in adhesive capacity among strains isolated from subjects with otitis media, septicemia, or meningitis or from healthy carriers.

B Andersson, B Eriksson, E Falsen, A Fogh, L A Hanson, O Nylén, H Peterson, C Svanborg Edén
PMCID: PMC350623  PMID: 7216490

Abstract

A method was developed to study the adhesion of Streptococcus pneumoniae to human pharyngeal epithelial cells. Epithelial cells from healthy persons, pneumococcal strains from patients with otitis media, meningitis, or septicemia, and pneumococcal cells from the nasopharynx of healthy carriers were used. Adhesion was found to be influenced by changes in the bacterial incubation medium and growth phase, the concentration of bacteria and epithelial cells, the epithelial cell donor, the incubation time and temperature, and the pH and osmolarity of the incubation medium. Pretreatment of bacteria with heat, Formalin, or trypsin decreased adhesion. The highest adhesion was obtained when 10(9) bacteria cultivated for 18 h in streptococcus cultivation broth were added to 10(4) pharyngeal cells and incubated at 37 degrees C for 30 min. S. pneumoniae strains from patients with frequent episodes of otitis media and strains from healthy carriers had the highest adhesion values; septicemia and meningitis strains had the lowest. The capsular polysaccharide type did not determine the adhesive capacity of the strains, but otitis strains belonging to the capsular types often associated with otitis media adhered in high numbers. Adhesion may be important for pneumococci colonizing the nasopharynx or inducing otitis media.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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