TABLE 2.

Tetracycline resistance of bacterial strains used in this study

Groupa	Bacterial strainb	Originc	Associated pathologyd	Serovare	Tetracycline MIC (μg/ml)
I	No. 4	Japan	Healthy	1	4
	SW 140	Japan	Healthy	2	4
	SW 114	Japan	Healthy	3	4
	SW 124	Japan	Healthy	4	4
	Nagasaki	Japan	Septicemia	5	4
	131	Switzerland	Healthy	6	4
	174	Switzerland	Healthy	7	4
	C5	Sweden	NK	8	4
	D74	Sweden	NK	9	2
	H367	Germany	Healthy	10	2
	H465	Germany	Pneumonia	11	4
	H425	Germany	Polyserositis	12	4
	IA-84-17975	United States	NK	13	8
	IA-84-22113	United States	NK	14	4
	SD-84-15995	United States	Pneumonia	15	4
II	HS306	VIC	Septicemia	NT	2
	HS68	QLD	Septicemia	5	4
	HS202	VIC	Septicemia	4	4
	HS14	QLD	NK	5	4
	HS357	SA	Septicemia	5	2
	HS356	SA	Septicemia	13	8
	HS333	VIC	Septicemia	5	4
	HS16	QLD	Septicemia	5	4
	HS307	VIC	Septicemia	NT	4
	HS72	QLD	Healthy	9	4
	HS145	TAS	Septicemia	1	4
	HS45	WA	Respiratory	4	4
	HS58	WA	Respiratory	NT	4
	HS29	VIC	NK	2	4
	HS226	VIC	Septicemia	NT	64
III	HS1919	NSW	Trachea	4	4
	HS1911	QLD	NK	4	8
	HS1913	NK	NK	14	2
	HS1906	VIC	Pneumonia	13	4
	HS1910	QLD	NK	1	2
	HS1895	NK	Pneumonia	2	2
	HS1859*	VIC	NK	8/9	64
	HS1854	WA	NK	4	4
	HS1848	VIC	Pneumonia	3	4
	HS1939	NK	NK	5	4
	HS1915	VIC	NK	5	4
	HS1905	QLD	NK	NT	2
	HS1889	VIC	Septicemia	NT	4
	HS1921	WA	Pneumonia	4	4
	HS1916	NSW	Pneumonia	4	2
IV	HS1857*	VIC	NK	8/9	64
	HS1858*	VIC	NK	5	4
	HS1543	VIC	NK	10	16
	HS1861*	VIC	NK	NK	64
	ATCC 27090	NK	NK	NK	4

^aGroup I, international reference strains; group II, genetically diverse Australian isolates; group III, recent Australian field isolates; group IV, additional strains used in this study.

^bAsterisk, strains isolated from the same outbreak. Underlined strains are tetracycline resistant. Strains HS1861 and ATCC 27090 are A. pleuropneumoniae.

^cNSW, New South Wales; QLD, Queensland; SA, South Australia; TAS, Tasmania; VIC, Victoria; WA, Western Australia.

^dNK, not known.

^eNT, nontypeable.