Journal of the Marine Biological Association of India

Volume 29 Issue 1&2

Antibiotic resistance of heterotrophic bacteria isolated from water and black clam in Cochin Backwater

K. R. Sreekumari and P. Lakshmanaperumalsamy

Bacterial strains isolated from water and the black clam Villorita cyprinoides var. cochinensis (Hartley) were tested for resistance to ten antibiotics namely ampicillin, bacitracin, chloramphenicol, gentamycin, neomycin, oxytetracycline, penicillin-G, polymyxin-B, streptomycin and sulphadiazine. Maximum number of strains (95.4%) showed resistance to penicillin. The resistance pattern was found to be Penicillin>Sulphadlazina>Ampicillin>Bacitracin>Streptomycin>Neomycin>PoIymyxin-B:> Oxytetracycline> Chloramphenicol>Gentamycin. The least resistance was offered to gentamycin by all the genera except Flavobacterium/Cytophaga group, which showed least resistance to Polymyxin-B. Strains of Vibrio spp. and Aeromonas spp. exhibited maximum resistance to sulphadiazine, whereas rest of the strains showed maximum resistance to penicillin.

Date : 31-12-1987