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Journal of Clinical Microbiology, Aug 1995, 2220-2221, Vol 33, No. 8
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Agglutination of Streptococcus suis by sialic acid-binding lectins

N Charland, JT Kellens, F Caya and M Gottschalk
Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculte de medecine veterinaire, Universite de Montreal, St.-Hyacinthe, Canada.

The 35 Streptococcus suis capsular-type reference strains as well as 45 field strains of type 2 were tested with sialic acid-binding lectins from Sambucus nigra (SNA I), Triticum vulgaris, Maackia amurensis, Homarus americanus, and Limax flavus. Only types 1, 1/2, 2, 14, 15, and 16 agglutinated with SNA I and/or the T. vulgaris lectin. All field strains agglutinated only with SNA I. Reaction with SNA I was probably due to the sialic acid moiety since it disappeared after sialidase treatment. These results confirm the presence of sialic acid in S. suis with the possible terminal sequence N-acetylneuraminic acid- alpha(2,6)GalNAc.

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