Fig. 2: ESBL-plasmids spread at variable rates in the absence of antibiotics (1st generation in vitro experiment).
From: Plasmid- and strain-specific factors drive variation in ESBL-plasmid spread in vitro and in vivo

Plasmid spread was measured as the final transconjugant frequency, i.e. the ratio of the recipient population carrying the ESBL-plasmid (T), relative to the total of plasmid-free (R) and plasmid carrying (T) recipient populations. Final transconjugant frequency is shown for recipient populations of E. coli strains RE1-3 (A) and S. Typhimurium strain RS (B). Circles represent independent replicates (n = 4–6) and the beams are mean values ± standard error of the mean (SEM). The detection limit was at ~10−8. Total population densities can be found in Supplementary Fig. S11.