ISOLATION AND ANTIBIOTIC SUSCEPTIBILITY PATTERN OF ESCHERICHIA COLI ISOLATES FROM STOOLS OF DIARRHOIEC CHILDREN BELOW 5 YEARS IN NIGERIA
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- NGN 3000
ABSTRACT
E. coli has become widespread in distribution and recognised both as harmless commensal and a versatile pathogen. It has emerged as an important cause of diarrhoea illness with diverse phenotypes and pathogenicic mechanisms. E. coli and other members of the family enterobacteriaceae are well known to develop or acquire resistance to a variety of antibiotics by different mechanisms. Seventy (70) isolates of Escherichia coli from stool of diarrhoeic children below five (5) years of age with suspected gastrointestinal infections attending two hospitals and a primary health care centre in Zaria were screened for their susceptibility to a panel of nine commonly used antibiotics by the disc diffusion method. Escherichia coli isolates which were resistant to multiple antibiotics and showed minimum inhibitory concentration between 20 – 100 µg/ml against ciprofloxacin were used for conjugation studies. Curing experiments of the transconjugants and resistant Escherichia coli isolates was carried out with acridine orange to determine if the resistant determinants were plamid mediated . High level of resistance was observed to Amoxicillin (100%), Ampicillin (100%), Tetracycline (100%), Sulphamethoxazole/Trimethoprim (97.1%), Ceftazidime (88.6%), Cefuroxime (85.7%) while lower resistance were observed to Gentamicin (35.7%), Ciprofloxacin (40%) and Ceftriaxone (58.6%). Sixteen isolates (22.9%) were found to be resistant to all the 9 antibiotics used. Sixtyeight isolates (97.1%) were identified as being resistant to multiple antibiotics since they were simultaneously resistant to at least three different antibiotics with seventeen (17) different phenotypic patterns. The multiple antibiotic resistance indices (MARI) for the MAR isolates was found to be high, between 0.3 to 1.0 suggesting that the isolates originated from an environment where antibiotics were often used. Plasmid DNA analysis on thirty-five resistant isolates showed 11 plasmid band sizes with molecular weights ranging from 2800 bp to > 5000 bp. Three isolates were found to harbour the IncK epidemiologic plasmid encoding gene for the blaCTX-M of the ESBLs and nineteen resistant isolates were also found to harbour the gyrB gene. The results of this study indicates that resistance to ampicillin, amoxicillin and cotrimoxazole is remarkably high in Zaria, and their continued usefulness in the treatment of E. coli infections in children need to be reviewed. In contrast, gentamicin, ceftriaxone and ciprofloxacin were more efficacious but the later (ciprofloxacin) is however contraindicated in children below 12 years of age. Plasmid borne resistant genes among the Escherichia coli isolates were more from the stools of children obtained from the General Hospital, Kofan-Gaya, Zaria-city, Nigeria.
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