Based on its capsule, how many Actinobacillus pleuropneumoniae serotypes are known?
See a clue in the article Serotyping of Actinobacillus pleuropneumoniae field isolates by PCR
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incorrect answer
Based on its capsule, there are 18 App serotypes known, with serotypes 1, 5, 9 and 11 being the most virulent.
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