Prevalence of beta-lactam nonsusceptible Gram-negative bacilli and use and interpretation of current susceptibility breakpoints: a survey of infectious disease physicians.

Beta-lactam-resistant Enterobacteriaceae represent an important public health problem; however, questions exist about their prevalence and the impact of recent breakpoint changes on clinical practice. We surveyed infectious disease physicians to better understand these issues. Many reported encountering resistant Enterobacteriaceae; respondents generally favored a more conservative interpretation of antimicrobial susceptibility results.