The IC50: an exactly defined measure of antibiotic sensitivity.

@article{Soothill1992TheIA,
  title={The IC50: an exactly defined measure of antibiotic sensitivity.},
  author={James S Soothill and Robyn C Ward and Alan J Girling},
  journal={The Journal of antimicrobial chemotherapy},
  year={1992},
  volume={29 2},
  pages={137-9}
}
The concentration of gentamicin that inhibits the growth of half of an inoculum of Pseudomonas aeruginosa (IC50) was estimated by doing viable bacterial counts with varying concentrations of gentamicin and fitting a probit inhibition curve to the results. This is a more precisely defined measure than the MIC and its standard error is readily calculable. 

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