# Negative frequency dependent selection on plasmid carriage and low fitness costs maintain extended spectrum β-lactamases in Escherichia coli

> Research article (Scientific Reports, 2019) · cited 41× · AI/ML

**Wikidata**: [openalex:W2988308723](https://www.wikidata.org/wiki/openalex:W2988308723)  
**Source**: https://4ort.xyz/entity/negative-frequency-dependent-selection-on-plasmid-carriage-and-low-fitness-costs-maintain-extended-spectrum-lactamases-i