Anti-Bacterial Agents/pharmacology; DNA Gyrase/drug effects; DNA Gyrase/genetics; DNA Topoisomerase IV/drug effects; DNA Topoisomerase IV/genetics; DNA, Bacterial/analysis; DNA, Bacterial/genetics; Diarrhea/drug therapy; Diarrhea/epidemiology; Diarrhea/microbiology; Disease Outbreaks; Drug Resistance, Multiple, Bacterial/drug effects; Drug Resistance, Multiple, Bacterial/genetics; Enterotoxigenic Escherichia coli/genetics; Enterotoxigenic Escherichia coli/isolation & purification; Enterotoxigenic Escherichia coli/pathogenicity; Escherichia coli/classification; Escherichia coli/drug effects; Escherichia coli/genetics; Escherichia coli/isolation & purification; Escherichia coli Infections/drug therapy; Escherichia coli Infections/epidemiology; Escherichia coli Infections/genetics; Escherichia coli Infections/microbiology; Fluoroquinolones/pharmacology; Genes, MDR/genetics; Humans; India/epidemiology; Integrons/genetics; Microbial Sensitivity Tests; Mutation/drug effects; Mutation/genetics; Quinolones/pharmacology