Taken together, our results suggest that care is needed in interpreting MIC tests and other laboratory growth assays for β -lactam antibiotics, since there may be significant degradation of the antibiotic during the assay. http://dx.doi.org/10.13039/501100000266 Engineering and Physical Sciences Research Council http://orcid.org/0000-0002-0101-4194 Brouwers Rebecca http://dx.doi.org/10.13039/501100000781 European Research Council 682237 EVOSTRUC http://orcid.org/0000-0003-4110-2962 Allen Rosalind J.
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