Korean Journal of Veterinary Research 1983;23(2):173-178.
Isolation of Citrate-Utilizing Variants of Escherichia coli from Cattle, Pigs, Chickens, Pigeons and Wild Animals
Hun-Jun Lee1, Won-Pil Choi2
1Department of Vettrinary Medicine, College of Agriculture, Chungnam National University
2Department of Veiltrinary Medicine, College of Agriculture, Gyeongbug National University
동물유래(動物由來)의 Citrate이용대장균(利用大腸菌) 변이주(變異株)에 관하여
이헌준1, 최원필2
1충남대학교 농과대학
2경북대학교 농과대학
This paper deals with the isolation of citrate-utilizing variants of Escherichia coli ($Cit^+$ E. coli) from the animals, their biochemical reactivity and antibiotic susceptibility, and whether the citrate utilizing ability is transmissible. One hundred arid twenty-three isolates of $Cit^+$ E. coli were obtained from cattle and pigs. but from other animals, no isolates were obtaied. Antibiotic susceptibility testing of $Cit^+$ E. coli was performed by the agar dilution method, using the following 9 antibiotics, chloramphenicol(CP), tetracycline(TC), streptomycine(SM), kanamycin(KM), colistin(CL), gentamicin(GM), cephaloridine(CR), aminobenzycillin and nalidixic acid(NA). All the variants tested were susceptible to KM, CL, GM, CR and NA. Of all the variants, 80(65%) were resistant to the drugs tested and resistance to TC and SM was most frequent. The transmission of the ability to utilize citrate on Simmons citrate agar at $37^{circ}C$ was demonstrated in 78(67.8%) out of the 115 $Cit^+$ E. coli. There were no significant difference in the transfer rates of citrate utilizing ability between resistant and susceptible variants to above 9 drugs. Of 123 isolates, 8 were lost their citrate utilizing ability, spontaneously.

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