Table 5.

Antibiotic resistance and biofilm formation of 240 S. Typhimurium isolates of different MLST types.

MLST typea	No. (%) of antibiotic classes to which isolates were resistantb									Biofilm formation categoryc				Total
	0	1	2	≥ 3	3	4	5	6	7	N	W	M	S
ST34	1 (0.60)	2 (1.20)	5 (2.99)	159 (95.21)	14	24	33	62	26	15 (8.98)	31 (18.56)	37 (22.16)	84 (50.30)	167
ST19	4 (7.02)	10 (17.54)	20 (35.09)	23 (40.35)	1	4	4	7	7	29(50.88)	19 (33.33)	6 (10.53)	3 (5.26)	57
ST36	0 (0.00)	0 (0.00)	0 (0.00)	6 (100.00)	4	1	0	1	0	3 (50.00)	3 (50.00)	0 (0.00)	0 (0.00)	6
ST1544	0 (0.00)	1 (25.00)	3 (75.00)	0 (0.00)	0	0	0	0	0	2 (50.00)	1 (25.00)	1 (25.00)	0 (0.00)	4
ST1557	0 (0.00)	1 (100.00)	0 (0.00)	0 (0.00)	0	0	0	0	0	1 (100.00)	0 (0.00)	0 (0.00)	0 (0.00)	1
ST1963	0 (0.00)	0 (0.00)	0 (0.00)	1 (100.00)	0	0	0	1	0	0 (0.00)	0 (0.00)	0 (0.00)	1 (100.00)	1
ST1958	0 (0.00)	0 (0.00)	0 (0.00)	1 (100.00)	0	0	0	1	0	0 (0.00)	1 (100.00)	0 (0.00)	0 (0.00)	1
ST516	0 (0.00)	0 (0.00)	1 (100.00)	0 (0.00)	0	0	0	0	0	1 (100.00)	0 (0.00)	0 (0.00)	0 (0.00)	1
ST241	0 (0.00)	0 (0.00)	0 (0.00)	1 (100.00)	0	0	1	0	0	1 (100.00)	0 (0.00)	0 (0.00)	0 (0.00)	1
ST99	0 (0.00)	1 (100.00)	0 (0.00)	0 (0.00)	0	0	0	0	0	0 (0.00)	1 (100.00)	0 (0.00)	0 (0.00)	1

^aData in the table are expressed as the number of isolates.

^bEighteen different antibiotics were divided into seven classes of antibiotics: penicillins, cephems, aminoglycosides, folate pathway inhibitors, quinolones, tetracyclines and phenicols.

^cDifferent categories of biofilm production are represented by the following abbreviations: N, not biofilm producer; W, weak biofilm producer; M, moderate biofilm producer; S, strong biofilm producer.