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. 1991 Oct 1;88(19):8317–8321. doi: 10.1073/pnas.88.19.8317

Hyaluronic acid capsule is a virulence factor for mucoid group A streptococci.

M R Wessels 1, A E Moses 1, J B Goldberg 1, T J DiCesare 1
PMCID: PMC52499  PMID: 1656437

Abstract

Mucoid strains of group A Streptococcus have been associated with recent outbreaks of acute rheumatic fever. The mucoid colony morphology of these strains is a result of abundant production of capsular polysaccharide, which is composed of hyaluronic acid. To study the role of the hyaluronic acid capsule in virulence, we derived an acapsular mutant from a mucoid strain of group A Streptococcus by transposon mutagenesis. M protein expression was not altered in the mutant strain. The mucoid wild-type strain grew in fresh human blood and was resistant to phagocytic killing in vitro. In contrast, the acapsular mutant failed to grow in fresh human blood and was sensitive to phagocytic killing in vitro. Loss of capsule was associated with a 100-fold reduction in virulence of the organisms in mice. We conclude that the hyaluronic acid capsule protects mucoid group A streptococci from phagocytosis and has an important role in virulence.

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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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