Seasonal and Ascending Trends in the Incidence of Carriage of Extended-Spectrumβ-Lactamase–ProducingEscherichia coliandKlebsiellaSpecies in 2 German Hospitals

In the present study, we demonstrated that the monthly incidence of carriage of ESBL-producing bacteria was highly correlated with the mean monthly temperature, a fact that should be considered in experimental studies as an additional parameter influencing the incidence of ESBL-producing bacteria.