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The substantial progresses during the last decades in the field of infectious diseases have significantly improved their prevention, diagnosis and treatment. Basic and medical sciences have efficiently dealt with the challenges of emerging infections, infectious complications related to the increasing complexity of medical practices and marked slow-down in the development of new antimicrobial agents. During the worldwide crisis related to the COVID-19 pandemic, the « medical normality » has been put in stand-by, but medical advances have fortunately continued. In the present article we present new knowledge in the field of bacterial, viral and fungal infections, which may modify hospital and ambulatory practices. Significant achievements in the field of COVID-19 will be presented in a future article., Competing Interests: Les auteurs n’ont déclaré aucun conflit d’intérêts en relation avec cet article.

When requesting a blood level measurement in the context of "Therapeutic drug monitoring" (TDM), numerous aspects have to be considered in the pre-analytical and analytical area, as in the integration of associated clinical data. This review presents therapeutic classes for which a clinical benefit of TDM is established or suggested, at least in some settings. For each class of drugs, the main pharmacokinetic, pre-analytical, analytical and clinical aspects are evaluated in the scope of such a monitoring. Each step of the TDM process is important and none should be neglected. Additional clinical trials are however warranted to better establish the exact conditions of use for such a monitoring.