Table 2.

Results of antimicrobial residue testing by Charm II and LC-MS/MS among 9 shrimp samples that tested positive by PremiTest.

Sample ID	Description	Charm II (antimicrobial class)	LC-MS/MS (antimicrobial)	Concentration of antimicrobial active ingredient (μg/kg)	MRL (μg/kg)
1	White leg shrimp, dead	Tetracyclines	Tetracycline	590.7	100
		Sulfonamides	Sulfamethoxazole	157.6	100
			Flumequinea	38.5	200
2	White leg shrimp, dead	Tetracyclines	Oxytetracycline	122.2	100
			Ciprofloxacin*	30	Not allowed
3	White leg shrimp, dead	Macrolides	ND	–	–
			Flumequinea	41.2	200
4	White leg shrimp, dead	Tetracyclines	Oxytetracycline	43.7	100
5	White leg shrimp, dead	ND	ND	–	–
6	White leg shrimp, live	ND	ND	–	–
7	White leg shrimp, live	ND	ND	–	–
8	White leg shrimp, live	ND	ND	–	–
9	Tiger shrimp, dead	ND	ND	–	–

^aHighest priority, critically important antimicrobial; ND=Not detected; MRL = Maximum Residue Limits according to Vietnamese regulation.