Description of 14 new capsular types of Streptococcus suis.
Fourteen new capsular types of Streptococcus suis (types 9 to 22) are described. All reference strains are morphologically and biochemically similar to types previously described. Reference strain types 9 to 13, 15, 16, and 22 were isolated from diseased pigs, whereas types 17 to 19 and 21 came from clinically healthy pigs; type 14 was isolated from a human case of meningitis, and type 20 was isolated from a diseased calf. The group T streptococcus of de Moor has been included in the typing system as type 15. Two-way cross-reactions between types 6 and 16 and a one-way cross-reaction between types 2 and 22 have been demonstrated. In addition, several cross-reactions probably not due to capsular material were detected among different types by using the coagglutination test. This test should not be used alone; weak or multiple positive reactions must be confirmed by the capsular reaction test or the capillary precipitation test.
Gottschalk
M
M
Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, Quebec, Canada.
Higgins
R
R
Jacques
M
M
Mittal
K R
KR
Henrichsen
J
J
D000372:Agglutination Tests; D000818:Animals; D000942:Antigens, Bacterial / Q000032:analysis / Q000276:immunology; D003429:Cross Reactions; D000939:Epitopes / Q000032:analysis / Q000276:immunology; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D008854:Microscopy, Electron; D013290:Streptococcal Infections / Q000382:microbiology / Q000662:veterinary; D013291:Streptococcus / Q000145:classification* / Q000276:immunology / Q000648:ultrastructure; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology
D000942:Antigens, Bacterial; D000939:Epitopes; D007106:Immune Sera