Streptococcus suis
serotypes have traditionally been identified by morphology, biochemical profiling and serotyping.
Analysis of the sequences of 16S rRNA and cpn
60 genes of the 35 characterized serotypes of S. suis
led to the observation that
two serotypes 32 and 34, are significantly distinct from other S. suis serotypes and may represent a distinct species. Here we present DNA sequence data and biochemical profiles which indicate that
S. suis serotypes 32 and 34, isolated from pigs, are
clustered with Streptococcus orisratti , a Voges-Proskauer negative, a-haemolytic, aesculin-hydrolytic, Lancefield group A
streptococcus isolated from the teeth of rats.