Table 1.

Characterization of mercury-resistant Aeromonas species.

Strain	Specie	MIC HgCl2 (μg/mL)	Volatilization assay	merA gene amplification*	merA gene hybridization	merR gene amplification	Antibiotic resistance pattern
6610	A. hydrophila	400	+	+	ND	−	TET
6632	A. hydrophila	200	+	+	+	+	S
6479	A. hydrophila	300	+	+	ND	+	TET, NAL, TMP, STR
6698	A. hydrophila	200	+	+	ND	−	S
6689	A. hydrophila	200	+	−	+	+	S
6587	A. hydrophila	200	+	+	ND	+	TET, NAL, TMP, STR
6492	A. hydrophila	200	+	+	ND	−	S
6376	A. hydrophila	25	+	−	+	−	TET
5794	A. hydrophila	200	+	−	+	+	TET, TMP, STR
3510	A. hydrophila	200	+	+	ND	+	S
3611	A. hydrophila	600	+	+	ND	+	TET
6640	A. aquariorum	300	+	−	+	+	TET, NAL, TMP
6336	A. aquariorum	200	+	−	+	−	TET, NAL, TMP
3430-1	A. aquariorum	300	+	+	ND	+	TET, TMP, STR
6597	A. caviae	25	+	+	ND	+	TET, TMP
6626	A. caviae	300	+	+	ND	−	TET, TMP
6425	A. caviae	200	+	+	ND	+	TET, TMP
6436	A. caviae	25	+	+	ND	−	TET, TMP
6661	A. caviae	25	+	−	+	+	TMP
6582	A. caviae	25	+	−	+	+	TET, TMP
6548	A. caviae	25	+	−	+	−	TMP
5881	A. caviae	200	+	−	+	+	TMP, STR
5919	A. caviae	25	+	−	+	−	TET, TMP
3817	A. caviae	300	+	−	+	+	TET, NAL, TMP, STR
6654	A. veronii	200	+	−	+	+	S
5869	A. veronii	200	+	+	ND	−	TET, NAL, TMP
5933	A. veronii	300	+	+	ND	+	TET, TM, CAM
3925	A. media	25	+	−	+	−	TMP, STR

TET, Tetracycline; TMP, Trimethoprim; STR, streptomycin; NAL, nalidixic acid; CAF, Chloramphenicol; ND, not done; S, sensitive to all antibiotics tested.

^*Amplified with primers MerA1F/MerA1R and MerA1/MerA2.