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2000; Guerrant et?al. 2001). Antimicrobial susceptibility testing (agar dilution) was performed according to Clinical Laboratory and Standards Institute (CLSI) recommendations (CLSI 2008). Calculation of percentage resistance was based on CLSI clinical breakpoints. Ciprofloxacin resistance of E.?coli is summarized in Table?1 for cattle, pigs and chickens; details have been published elsewhere (Bywater et?al. 2004; de Jong et?al. 2009a,b). Clinical resistance remains for cattle and pigs at a very low level ( http://www.selleckchem.com/products/loxo-101.html 24%). Without considering Spain, the mean resistance in chickens amounted to 2��0 and 1��9%, respectively. In 1999�C2000, Spain was not included in the survey. The low isolation rate of salmonellae made http://www.selleckchem.com/products/abc294640.html it necessary to supplement the collection with isolates from some national collections, in particular for cattle. Additions, where feasible, have been made with isolates that fulfilled the selection criteria, but nevertheless, numbers remained low and preclude any country comparisons. However, the total numbers do enable some conclusions. Ciprofloxacin resistance was completely absent over the three sampling periods in the three target species (Table?2). The outcome is identical when ciprofloxacin breakpoints (>1?mg?l?1) of EUCAST http://www.selleck.cn/products/ON-01910.html (European Committee on Antibiotic Susceptibility Testing) are applied. For fluoroquinolones, not only clinical breakpoints are of relevance, but, for monitoring purposes, it is also necessary to address the population of isolates with decreased susceptibility, yet which remain clinically responsive. This can be achieved by application of epidemiological cut-off values, which are defined by the highest MIC value of the wild-type population. An isolate may develop decreased susceptibility to a given antibiotic but still has a sufficiently low MIC to allow successful therapy. This population can be calculated based on epidemiological cut-off values (formerly also termed ��microbiological breakpoints��), which have been recently set by EUCAST (http://www.eucast.org). The relationship between epidemiological cut-off values and the clinical breakpoints is depicted schematically in Fig.?1. The number of isolates with MIC values exceeding the wild-type MIC distribution (>epidemiological cut-off value) but not deemed to be clinical resistant (