A WDM optical system including a media converter module including a plurality of converter cards, each converter card being configured to convert a native signal into an optical signal. The method uses a database classifying the micro-organism species and the resistance mechanism to various antimicrobial agents, and containing, for each species and each resistance mechanism, parameters characteristic of the frequency distribution of minimum inhibitory concentrations for a group of antimicrobial agents. The valve may take the form of a compression or rebound valve on the piston of the vehicle damper, or a base valve in a dual tube damper.