Abstract
Of a total of 561 isolates of Streptococcus suis recovered from various tissues of diseased pigs, 464 were from veterinary laboratories in Quebec and 97 were from western Canada, particularly Alberta (84). Almost 83% of all these isolates belonged to the 23 known S. suis capsular types. There was no marked difference between the two groups of isolates. Capsular type 2 was the most prevalent and represented 32% of all isolates. The other important capsular types were, in decreasing order, 3, 1/2, 8 and 4. Lungs, brain, and meninges were the source of the majority of isolates. More than 40% of all S. suis isolates were found in pure culture. The number of isolations of this microorganism was higher in piglets aged five to eight weeks than in any other age group.
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