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. 1992 Aug;60(8):3244–3252. doi: 10.1128/iai.60.8.3244-3252.1992

Interaction of capsulate Haemophilus influenzae with human airway mucosa in vitro.

R C Read 1, A A Rutman 1, P K Jeffery 1, V J Lund 1, A P Brain 1, E R Moxon 1, P J Cole 1, R Wilson 1
PMCID: PMC257308  PMID: 1353481

Abstract

Two pairs of isogenic capsulate and noncapsulate and one pair of capsulate fimbriate and nonfimbriate strains of Haemophilus influenzae type b were studied in an organ culture of human respiratory mucosa. Over 24 h, the numbers of recovered bacteria increased from the original inoculum size of 10(5) to 10(8) CFU/ml. Transmission electron microscopy and scanning electron microscopy showed that noncapsulate organisms caused significant epithelial damage, whereas capsulate strains did not. Association of noncapsulate bacteria with damaged epithelial cells was observed by 14 h of incubation. In contrast, capsulate organisms were associated with a dense, thick, gel-like matrix which was observed above the epithelial surface. These capsulate organisms were not seen to associate with the epithelial surface (by transmission electron microscopy), though they were occasionally seen adhering to cells by scanning electron microscopy. Fimbriate capsulate H. influenzae showed increased adherence to buccal cells compared with nonfimbriate capsulate organisms. There was also association of fimbriate capsulate bacteria with damaged organ culture epithelium in one of four experiments. It is concluded that both capsule and fimbriae affect the interaction of H. influenzae with human airway mucosa in vitro by influencing adherence to and damage of the epithelium.

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Selected References

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