Efflux-Mediated Antimicrobial Resistance in Bacteria

XIAN-ZHI LI, M.D., Ph.D. , is a Team Leader at the Veterinary Drugs Directorate of Health Canada for regulation of drug products, dealing with microbiological and toxicological safety assessments of drugs as well as antimicrobial drug policy. Dr. Li received his medical degree and a M.Sc. in Pharmacology, respectively, from Luzhou Medical College and West China University of Medical Sciences (WCUMS [now Sichuan University]; with Dr. Yu-Sheng Wang) in China in the 1980s, followed by a faculty appointment in Pharmacology at WCUMS. He later obtained another M.Sc. and Ph.D. in Microbiology from the University of Saskatchewan (with Dr. Kurt E. Williams) and Queen's University, Kingston (with Dr. Keith Poole) in Canada, respectively. He has been actively involved for over a decade in the Canadian Integrated Program for Antimicrobial Resistance Surveillance (CIPARS) under the Public Health Agency of Canada. He is also an advisor to the Veterinary Antimicrobial Susceptibility Testing Subcommittee of the Clinical and Laboratory Standards Institute (CLSI). He has published over 80 peer-reviewed articles on antimicrobial resistance with notable contributions to the seminal discovery and characterization of RND drug efflux pumps of Pseudomonas and Stenotrophomonas at the University of California, Berkeley (with Dr. Hiroshi Nikaido) and Queen's University. His interests include antimicrobial resistance evolution, mechanisms and risk assessment.

CHRISTOPHER A. ELKINS, Ph.D. , is Director of the Division of Molecular Biology at the Center for Food Safety and Applied Nutrition (CFSAN), US Food and Drug Administration (FDA). Dr. Elkins received a Bachelor of Arts degree in Biology and History from Case Western Reserve University in 1994 and a Ph.D. degree in Microbiology from the University of Tennessee, Knoxville in 2001 under the mentorship of Dr. Dwayne C. Savage. He subsequently was appointed as postdoctoral fellow in the Department of Molecular and Cell Biology at the University of California at Berkeley in the laboratory of Dr. Hiroshi Nikaido. During his 12 year tenure with FDA and previous to his appointment at CFSAN, he served as staff microbiologist and principal investigator in the Division of Microbiology at the FDA's National Center for Toxicological Research (NCTR) in Jefferson, Arkansas. His primary research interests involve enteric microbiology and antimicrobial resistance mechanisms as they relate to regulatory-based scientific needs. Current research direction in his Division includes genomic-scale analysis of probiotics and enteric foodborne pathogens, and metagenomic analysis of the gut microbiome to advance food safety research in molecular toxicology and nutrition. He is a member of the American Society for Microbiology for more than 17 years and serves as editor of Applied and Environmental Microbiology .

HELEN I. ZGURSKAYA, Ph.D ., is a Professor in the Department of Chemistry and Biochemistry at the University of Oklahoma in Norman, Oklahoma, USA. Dr. Zgurskaya received a M.Sc. degree in Microbiology from Dnepropetrovsk State University, Ukraine and a Ph.D. degree in Microbiology from Russian Academy of Sciences, Russian Federation. She subsequently held research appointments at Max Planck Institute of Molecular Genetics (Berlin, Germany), Stanford University Medical School and the University of California at Berkeley. In 2000, Dr. Zgurskaya joined the faculty of the Department of Chemistry and Biochemistry at the University of Oklahoma. She has published more than 50 peer-reviewed articles on mechanism of multidrug efflux and antibiotic resistance. Her current research focuses on mechanisms of bacterial multidrug efflux pumps and permeability of Gram-negative outer membrane.