Identification and antibiotic susceptibility evaluation of Mycoplasma synoviae isolated from chickens in central China

Table 1 Distribution of minimum inhibitory concentration (MIC, μg/mL) of antibiotics for strains isolated from different provinces of China

Antibiotics	Provinces					MIC₅₀	MIC₉₀
Antibiotics	Hubei	Henan	Hunan	Anhui	Jiangxi	MIC₅₀	MIC₉₀
Tylosin	0.125–1	1	0.25	2–4	0.25–0.5	0.25	4
Tylvalosin	≤0.0625–0.25	0.125	≤0.0625	0.25	≤0.0625	≤0.0625	0.25
Tiamulin	0.25–1	0.5	0.5–1	0.25–2	0.25	0.5	1
Tilmicosin	1–8	>32	8	>32	2–4	2	>32
Enrofloxacin	16–>32	8	16	16->32	16	16	>32
Lincomycin	0.5–2	>32	0.5–1	>32	0.5–1	1	>32
Doxycycline	≤0.0625–0.25	≤0.0625	0.5–1	≤0.0625–0.25	0.5–1	0.125	0.5
Chlortetracycline	0.25–4	0.25	8–16	0.5–1	4–8	1	8

Antibiotics were tested in the concentration range 0.0625–32 μg/mL. All MIC values are expressed in μg/mL and values that were below or above the dilution range are marked as ≤ or >, respectively. MIC₅₀ values indicate the concentration that inhibited 50% isolates. MIC₉₀ values indicate the concentration that inhibited 90% isolates