PLASMID MEDIATED ANTIBIOTICS RESISTANCE PROFILE AND NUCLEOTIDE SEQUENCE OF A NOVEL BROAD SPECTRUM β-LACTAMASE FROM UROPATHOGENIC ESCHERICHIA COLI BY
PLASMID MEDIATED ANTIBIOTICS RESISTANCE PROFILE AND NUCLEOTIDE SEQUENCE OF A NOVEL BROAD SPECTRUM β-LACTAMASE FROM UROPATHOGENIC ESCHERICHIA COLI BY
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Date
1998-07
Authors
NTIEJUMOKWU, SUNDAY
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Abstract
ABSTRACT
Genetic determinants responsible for bacterial resistance to commonly used and newly
introduced antibiotics in Nigeria were investigated. Of the 150 E. coli isolates from urinary
tract infections surveyed, 149 (99%) were resistant to at least two different antibiotics, and
131 (87%) were resistant to Unasyn(Ii). The commonest resistance pattern was combined
resistance to ampicillin, ampicillin/sulbactam, cefuroxime, tetracycline, trimethoprim/
sulfamethoxazole, and sulfamethoxazole
Seventy two (48%) of the tested isolates transferred resistant plasmids to a recipient strain,
E. coli K12CV601. Results showed that urinary tract infection is caused by genetically
unrelated strains of E. coli in the geographical regions of this country studied.
In this study a high incidence (87.3%) of resistance to ampicillin/sulbactam was observed
in UTI isolates from this country Whereas there was complete sensitivity to
amoxycillin/clavulanate and tiearcillin/elavulanate, the combination of ampicillin and
sulbactam, which combines a β-lactam antibiotic with a β-lactamase inhibitor was grossly
ineffective.
This study indicates that the attempt at using sulbactam as a component of Unasyn(R) in
dealing with all types of β-lactamasc-mediatcd antibiotic resistance in Nigeria is only
marginally effective since only 16 out of 147 (1 1%) isolates resistant to ampicillin were
sensitive to the combination. The ampicillin/sulbactam combination would be expected to
be more effective for bacterial infections not involving E. coli producing extended broad
spectrum bcta-lactamase.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL
FULFILLMENT OF THE REQUIREMENTS FOR THE
AWARD OF DOCTOR OF PHILOSOPHY IN
PHARMACEUTICAL MICROBIOLOGY
Keywords
PLASMID, MEDIATED, ANTIBIOTICS, RESISTANCE, PROFILE AND, NUCLEOTIDE SEQUENCE, NOVEL, BROAD SPECTRUM, -LACTAMASE, FROM, UROPATHOGENIC, ESCHERICHIA COLI