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A method is described which may be used to compare the relative activity of beta-lactam antibiotics against gram-negative bacilli. The method offers several important advantages over conventional methods of evaluation of the antibacterial activity of beta-lactam agents: the bacterial inoculum is simply and accurately standardized; the response of the culture is continuously monitored and information is obtained on both the intrinsic activity of the agent and its susceptibility to enterobacterial beta-lactamases. In this way, differences in the antibacterial activity of compounds which appear similar on the basis of more conventional tests may be revealed.
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David Greenwood (2009) studied this question.
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