Characterization of pig tonsils as niches for the generation of Streptococcus suis diversity

Table 3 Number of isolates and resistance rates (in brackets) of each antimicrobial agents by origin and sequence types (STs)

Agent^*	Total n = 92	Origin		ST
Agent^*	Total n = 92	Tonsils n = 50	Vegetations n = 42	ST28 n = 42	Other STs n = 50
AZM	62 (67.4%)	30 (60.0%)	32 (76.2%)	29 (69.0%)	33 (66.0%)
CAM	62 (67.4%)	30 (60.0%)	32 (76.2%)	29 (69.0%)	33 (66.0%)
CLDM	67 (72.8%)	35 (70.0%)	32 (76.2%)	29 (69.0%)	38 (76.0%)
TC	71 (77.2%)	38 (76.0%)	33 (78.6%)	32 (76.2%)	39 (78.0%)
PCG	2 (2.2%)	2 (4.0%)	0 (0.0%)	0 (0.0%)	2 (4.0%)

^*The minimum inhibitory concentrations were tested for penicillin (PCG), ampicillin (ABPC), cefepime (CFPM), ceftriaxone (CTRX), azithromycin (AZM), clarithromycin (CAM), clindamycin (CLDM), levofloxacin (LVFX), and tetracycline (TC), and breakpoints were taken from the Clinical and Laboratory Standard Institute (CLSI) criteria in M100-ED33 for the Streptococcus spp. viridans group (CLSI, 2023). There was no isolate resistant for ABPC, CFPM, CTRX, and LVFX.

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