Minimal inhibition concentration of chlortetracycline to Aeromonas hydrophila [isolated from septicemic and wounded snakehead fish (Ophiocephalus striatus)]
1984
Kriengsak Poonsuk | Kreingsak Saitanu | Somatat Wongsawang (Chulalongkorn Univ., Bangkok (Thailand). Faculty of Veterinary Science. Dept. of Pathology)
The determination of minimal inhibition concentration (MIC) of Chlortetracycline to Aeromonas hydrophlia was studied. Ninety strains of organism were isolated from septicemic and wounded snake head fishes (Ophiocephalus striatus) received from Samuthsakorn, Chacherngsoa, Cholburi, and Suparnburi province. The strains isolated from Samuthsakorn were highly sensitive to chlortetracycline in which the MIC was varied from 0.186-1.49 mcg. The MIC of strains from Chacherngsoa and Cholburi was 0.37-23.92 mcg. The starin from Suparnburi showed highly resistance to drug in which MIC was 0.186-95.7 mcg. The percentage cumulative analysis of the inhibited strains by the varied concentration of the drug was done. The results showed that 76.9 and 92 percent isolated strains from Samuthsakorn, 88.5 and 97 percent isolated strains from Chacherngsoa and Cholburi, and 77.7 and 81 percent isolated strains from Suparnburi, were sensitive to 0.37 and 0.74 mcg., 0.74 and 1.49 mcg., and 29.9 and 47.8 mcg respectively
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