Fig. 2

a Net growth rate (h⁻¹) of the isolates in the absence of tetracycline, grouped according to tetracycline MIC. b Net growth rate (h⁻¹) of tetracycline susceptible and resistant isolates grown in increasing concentrations of tetracycline. c Relative growth onset of the isolates when grown in increasing concentrations of tetracycline. a, b Green box plots refer to estimated net growth rates of tetracycline susceptible isolates, red boxplots to estimated net growth rates from tetracycline resistant isolates. Black dots indicate mean net growth rate (h⁻¹) of the individual isolates. a–c Outliers are shown as circled dots. The number of isolates in each group is indicated in brackets