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The aim of this study was to determine the biochemical properties of  Streptococcus suis strains isolated from healthy and deceased pigs. For this  research we tested 34 S. suis strains isolated from deceased pigs that had  clinical signs of septicemia and meningitis, as well as from clinically  healthy pigs. The strains that have been already confirmed with specific  antisera were tested using commercial battery of biochemical tests (API 20  Strep and ID 32 Strep) to determine the dominant biochemical characteristics  that can be used in diagnosis of bacterial infection if specific S. suis  antisera are not available. The main results showed that all S. suis strains  were postive in esculine, trehalose, glycogen, lactose, sacharose, starch,  leucine aminopeptidase, alanine-phenyl-alanine-proline arylamidase tests,  while negative in Voges-Proskauer, hipurate, ribose, arabinose and sorbitol  tests. S. suis strains were in high percentage positive in arginine  dihydrolase, β-glucoronidase, α-galactosidase, β-galactosidase,  methyl-β-dglucopyranoside, glycyl-tryptophan arylamidase and inulin tests.  Athough S. suis is in highly positive in some tests, it can be concluded that  Voges-Proskauer, hipurate, trehalose, esculine tests, along with  β-glucoronidase (βGUR) and α- galactosidase (αGAL), were significant in  differentiation of this bacteria from other similar streptococci, along with  some other crucial features (α hemolysis on blood sheep agar, absence of  growth in 6,5% NaCl broth). [Projekat Ministarstva nauke Republike Srbije,  br. TR 31053]

Biochemical characteristics of Streptococcus suis strains isolated from healthy and deceased pigs