Volume 28, Number 1—January 2022
Research
New Sequence Types and Antimicrobial Drug–Resistant Strains of Streptococcus suis in Diseased Pigs, Italy, 2017–2019
Lucilla Cucco, Marta Paniccià, Francesca Romana Massacci, Alessandra Morelli, Massimo Ancora, Iolanda Mangone, Adriano Di Pasquale, Andrea Luppi, Denis Vio, Cesare Cammà, and Chiara Francesca Magistrali
Table 2
Distribution of MICs among 78 Streptococcus suis isolates from diseased pigs, Italy, 2017–2019*
| Antibiotic molecule | No. (%) isolates by MIC, μg/mL |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.12 | 0.25 | 0.5 | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 | 256 | 512 | |
| Penicillin G | 49 (63) | 7 (9) |
5 (6) |
14 (18) |
3 (4) |
||||||||
| Ampicillin | 73 (94) |
2 (3) |
3 (4) |
||||||||||
| Enrofloxacin | 1 (1) | 17 (22) |
57 (73) |
2 (3) |
1 (1) |
||||||||
| Tetracycline | 1 (1) |
3 (4) |
1 (1) |
73 (94) | |||||||||
| Florfenicol | 1 (1) | 3 (4) | 40 (51) | 32 (41) |
2 (3) | ||||||||
| TMP/SXT | 67 (86) |
11 (14) |
|||||||||||
| Clindamycin† | 8 (10) | 4 (5) |
4 (5) |
10 (13) |
50 (64) |
||||||||
| Tylosin† | 15 (19) | 61 (78) | |||||||||||
| Neomicin† | 22 (28) |
27 (35) |
15 (19) |
7 (9) | 5 (6) | ||||||||
| Gentamicin† | 12 (15) | 39 (50) | 17 (22) | 6 (8) | 2 (3) | ||||||||
| Sulfadimethoxine† | 19 (24) | 57 (73) | |||||||||||
*Gray shading indicates range of values actually tested for each antibiotic. Black vertical bars indicate threshold values for clinical resistance, according to the Clinical and Laboratory Standards Institute (https://clsi.org). TMP/SXT, trimethoprim/sulfamethoxazole. †Two isolates were not identified.
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Page updated: December 20, 2021
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