Data analysis was performed using the SPSS statistical analysis software, version 17.0 (SPSS Inc., Chicago, IL, USA). The MARI of an isolate was defined as a/b, where a represents the number of antibiotics to which the isolate was resistant, while b represents the number of antibiotics for which the isolate was examined [17 (link),38 (link),39 (link),45 (link)].
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