Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Population structure of Australian isolates of Streptococcus suis

Hampson, D.J.ORCID: 0000-0002-7729-0427, Trott, D.J., Clarke, I.L., Mwaniki, C.G. and Robertson, I.D.ORCID: 0000-0002-4255-4752 (1993) Population structure of Australian isolates of Streptococcus suis. Journal of Clinical Microbiology, 31 (11). pp. 2895-2900.

PDF - Published Version
Download (975kB)
Link to Published Version:
*Subscription may be required


The genetic diversity of 109 isolates of Streptococcus suis, which were recovered mainly from Australian pigs, was examined by multilocus enzyme electrophoresis. The collection was genetically diverse. Sixty-five electrophoretic types (ETs) were recognized, with a mean genetic diversity per enzyme locus of 0.512, or 0.431 when the number of isolates in each ET was considered. Serotype diversity varied, being greatest for isolates of capsular serotype 15 (0.364), and then diminishing in the order of serotypes 9, 1, 4, 1/2 , 2, 7, and 3 (0.120). On average, isolates from these eight serotypes represented 4.13 separate clonal groups per serotype. This diversity indicated that serotyping of S. suis for subspecific differentiation is not a reliable technique for identifying specific strains and is not a good predictor of the genetic background of a given isolate. No tendency for isolates recovered from healthy pigs to be genetically distinct from those from diseased animals was found, nor were there consistent differences between isolates recovered from animals with different disease syndromes (meningitis, pneumonia, and septicemia). Danish reference strains of serotypes 1, 2, and 7 each belonged to one of the same clonal groupings of these types found in Australia, but Danish strains of serotypes 3, 4, 6, and 8 and a strain of serotype 1 from the United Kingdom were each genetically distinct from the Australian isolates. Generally, isolates in the same ET belonged to the same serotype, but one ET contained isolates of types 6 and 6/16, and three were made up of isolates of types 2 and 1/2 . One isolate of serotype 2, which was recovered from a human with meningitis, belonged to the same ET as two isolates of serotype 2 that were recovered from pigs. The human infection was therefore likely to have been zoonotic.

Item Type: Journal Article
Murdoch Affiliation(s): School of Veterinary Studies
Publisher: American Society for Microbiology
Copyright: © 1993, American Society for Microbiology
Item Control Page Item Control Page


Downloads per month over past year