Bookmark the CLSI store page for M45 Ed.4 . Request a quote from your lab’s administrative budget. Download the official PDF, print the critical tables, and laminate the QC reference page. In the fight against resistant pathogens, that document is your ultimate weapon.
Major editions (Ed.1, Ed.2, Ed.3, Ed.4) are released every 4-6 years. Interim updates may appear in the CLSI M100 supplement. Always check the "Current Editions" page on the CLSI website.
The margin notes and footnotes in the PDF are critical. For instance, the test for H. influenzae requires Haemophilus Test Medium (HTM), not standard Mueller-Hinton agar. These specific media requirements are detailed exclusively in the official document.