Characterization of gyrA mutations associated with fluoroquinolone resistance in Campylobacter coli by DNA sequence analysis and MAMA PCR

Increasing numbers of fluoroquinolone-resistant Campylobacter ter coli isol ates received at the Minnesota State Public Health Laboratory and at the Ce nters for Disease Control and Prevention have been a cause for concern. The gyrA quinolone resistance-determining regions of several fluoroquinolone-r esistant isolates were sequenced to examine the mechanism of resistance. Ci profloxacin-resistant C. coli isolates examined by DNA sequencing had a Thr -86 to Ile (ACT --> ATT) gyrA mutation, leading to resistance to fluoroquin olone antibiotics. A mismatch amplification mutation assay polymerase chain reaction protocol was developed to detect this gyrA mutation. (C) 2000 Fed eration of European Microbiological Societies. Published by Elsevier Scienc e B.V. All rights reserved.