These six antimicrobial agents presented the
highest MIC50 values and the antibiogram (19.2%) most frequently observed. Lower resistance rates among the b-Lactams
support their use as the primary drugs to treat the infection of S. suis. However, appropriate dosing or combination antibiotic
therapeutic regimens should be adhered to in view of the resistant and intermediate strains to penicillin (9.5% and 42.3%),
ampicillin (4.0% and 29.9%) and ceftiofur (22.1% and 37.3%), respectively.
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