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Comparison of the number of Streptococcus suis serotypes detected from rectal swabs in 25 of 64 clinical case animals and in nine of 64 control animals on 12 Ontario farms. The most frequent serotypes in case animals included 9 (n = 3), 30 (n = 3) and untypable (un) isolates (n = 15). The most frequent serotypes in control animals included serotype 9 (n = 3) and 28 (n = 2), as well as untypable isolates (n = 3).
