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. 1990 Jun;172(6):2833–2838. doi: 10.1128/jb.172.6.2833-2838.1990

Ultrastructural study of surface components of Streptococcus suis.

M Jacques 1, M Gottschalk 1, B Foiry 1, R Higgins 1
PMCID: PMC209078  PMID: 1971617

Abstract

The presence of capsular material on cells of nine reference strains of Streptococcus suis representing serotypes 1 to 8 and 1/2 was determined by transmission electron microscopy after polycationic ferritin labeling, immunostabilization, or fixation with a combination of glutaraldehyde and lysine. All the cells of the reference strains examined were covered with a layer of capsular material whose thickness varied between 20 to 30 nm and 350 to 375 nm when examined by immunostabilization. Capsular material from cells exposed to homologous antiserum was usually thicker than that from polycationic ferritin-labeled cells or cells fixed with glutaraldehyde-lysine. Negative staining revealed detectable surface structures on S. suis strains. All strains carried peritichous, thin, and flexible fimbriae with a diameter of approximately 2 nm and a length of up to 250 nm. This study indicated that morphological differences of surface structure exist among S. suis reference strains.

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Selected References

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