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Can Vet J. 2019 May;60(5):519-522.

Antimicrobial resistance of Streptococcus suis isolates recovered from clinically ill nursery pigs and from healthy pigs at different stages of production.

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Department of Population Medicine (Arndt, Farzan, Friendship), Department of Pathobiology (MacInnes), Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1.


in English, French

Streptococcus suis isolates (N = 379) from clinically ill pigs and from healthy pigs were tested for antimicrobial susceptibility using a disk diffusion method. Isolates from clinical cases had a higher prevalence of resistance compared with isolates from healthy pigs. There was a high to moderate prevalence of resistance to antibiotics commonly used in nursery pig diets such as tetracycline (84.2%), tiamulin (65.2%), and spectinomycin (40.4%). There was a low prevalence of resistance, however, to antimicrobials that are only used as parenteral treatments and not added to feed (e.g., ceftiofur, florfenicol). These findings should help practitioners in choosing appropriate drugs for use on Ontario swine farms.

[Available on 2019-11-01]

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