Antimicrobial Resistance Profile and Genotypic Characteristics of Streptococcus suis Capsular Type 2 Isolated from Clinical Carrier Sows and Diseased Pigs in China

Table 3

Distribution of antimicrobial resistance patterns, resistant determinants, virulence factors, and pulsotypes of S. Suis type 2 isolates.

Origin of isolates	Resistant pattern^a	Number of isolates	Number of isolates  with resistant determinants^b					Number of isolates with virulence genes^c (%)			PFGE subtypes; (number of isolates)
			intTn	ermB	mefA	tetM	tetO	mrp	epf	sly
Healthy sows; ()	Ery^rTil^rCli^rTet^r	35	0	33	16	33	30	16	33	26	C (5), D (8),; F (4), G (10), H (8)
	Ery^sTil^sCli^sTet^r	22	12	0	0	20	12	20	20	17	B (2), C (8),; G (8), E (4)
	Ery^sTil^sCli^sTet^s	5	/	/	/	/	/	5	5	4	G (3), H (2)
	Total	62	12	33	16	53	42	41	58	47	B (2), C (13),; D (8), E (4), F (4), G (21), H (10)
Diseased pigs; ()	Ery^rTil^rCli^rTet^r	2	0	2	2	2	2	2	2	2	A (2)
	Ery^sTil^sCli^sTet^r	26	26	0	0	22	7	26	24	26	A (10), E (14), G (2)
	Ery^sTil^sCli^sTet^s	6	/	/	/	/	/	6	6	6	A (2), E (4)
	Total	34	26	2	2	24	9	34	32	34	A (14), E (18), G (2)

Ery^r: erythromycin resistant; Til^r: tilmicosin resistant; Cli^r: clindamycin resistant; Tet^r: tetracycline resistant; Ery^s: erythromycin susceptible; Til^s: tilmicosin susceptible; Cli^s: clindamycin susceptible; Tet^s: tetracycline susceptible.
^bThe ermA, lnuB, tetK, tetL, and xis genes were not detected in the isolates included in this study.
^cAll isolates carried the fbp and orf2 genes and none harbored the gdh gene.
/: Not detected.