Antibiotic resistance pattern and R-plasmids of Acinetobacter calcoaceticus subsp. anitratus

During a 6 month period from March 1990 to August 1990, a total of 159 strains of Acinetobacter calcoaceticus subsp. anitratus were isolated from various samples and studied for antibiotic resistance pattern to 12 drugs by Kirby-Bauer method. Ceftazidime and Netilmycin were the most sensitive drugs followed by Cefotaxime, Norfloxacin and Augmentin. All the strains were resistant to Chloramphenicol and Tetracycline. Commonest pattern of resistance was ACGKSTSu. Forty eight isolates were tested for R-plasmids by conjugation experiments using Nalidixic acid resistant E. coli K12F-Lac+ as the recipient strain. The incidence of R-plasmids was 81.25%.