Antibiotic Resistance of Salmonella spp. Isolated from Shrimp Farming Freshwater Environment in Northeast Region of Brazil

Table 2

Minimum inhibitory (MIC) and bactericidal (MBC) concentrations of antibiotics tested against resistant Salmonella spp. strains isolated from water and sediment samples of ponds and inlet canal (Jaguaribe River) in two freshwater-acclimated Litopenaeus vannamei culture farms (A and B), Ceara, Brazil.

Location	Sample	Isolates	Concentration (𝜇g)
			Tetracycline				Penicillin		Nitrofuran
			TET		OTC		AMP		NIT
			MIC	MBC	MIC	MBC	MIC	MBC	MIC	MBC
Farm A	Inlet canal	Sw3	64	256	64	128	—	—	—	—
Farm B	Inlet canal	Sw10	64	64	64	64	640	>640	—	—
		Sw11a*	64	256	128	1024	—	—	—	—
		Sw15	128	256	64	512	>640	>640	6400	>12800
		Ss16	64	256	64	512	>640	>640	6400	>12800
		Ss17	64	256	64	512	>640	>640	12800	>12800

Sw: water-sample Salmonella; Ss: sediment-sample Salmonella; —: test not performed for this antibiotic.
∗Subpopulation.