A method and apparatus for estimating drug effectiveness from a drug diffusion sample are provided. The drug diffusion sample includes a plate having a medium containing a test organism and a plurality of antibiotic disks positioned on the plate in a medium. An inhibition zone surrounds each of the antibiotic...http://www.google.de/patents/US5618729?utm_source=gb-gplus-sharePatent US5618729 - Automated system and method for estimating antibiotic effectiveness from drug diffusion tests