Subject(s)

Cross Infection/microbiology , Enterobacteriaceae Infections/microbiology , Escherichia coli Infections/microbiology , Escherichia coli/enzymology , Klebsiella Infections/microbiology , Klebsiella pneumoniae/enzymology , beta-Lactamases/biosynthesis , Anti-Bacterial Agents/pharmacology , Bacterial Typing Techniques , Cluster Analysis , DNA Fingerprinting , Electrophoresis, Gel, Pulsed-Field , Escherichia coli/drug effects , Escherichia coli/genetics , Escherichia coli/isolation & purification , Genotype , Hospitals , Humans , Klebsiella pneumoniae/drug effects , Klebsiella pneumoniae/genetics , Klebsiella pneumoniae/isolation & purification , Microbial Sensitivity Tests , Paraguay , Plasmids , Polymerase Chain Reaction/methods , beta-Lactamases/genetics