title: Factors affecting the reversal of antimicrobial-drug resistance.
abstract: The persistence or loss of acquired antimicrobial-drug resistance in bacterial populations previously exposed to drug-selective pressure depends on several biological processes. We review mechanisms promoting or preventing the loss of resistance, including rates of reacquisition, effects of resistance traits on bacterial fitness, linked selection, and segregational stability of resistance determinants. As a case study, we discuss the persistence of glycopeptide-resistant enterococci in Norwegian and Danish poultry farms 12 years after the ban of the animal growth promoter avoparcin. We conclude that complete eradication of antimicrobial resistance in bacterial populations following relaxed drug-selective pressures is not straightforward. Resistance determinants may persist at low, but detectable, levels for many years in the absence of the corresponding drugs.
authors.affiliation: Department of Pharmacy, Faculty of Medicine, University of Tromsø, Tromsø, Norway. paal.johnsen@uit.no
authors.forename: Pål J
authors.initials: PJ
authors.lastname: Johnsen
authors.forename: Jeffrey P
authors.initials: JP
authors.lastname: Townsend
authors.forename: Thomas
authors.initials: T
authors.lastname: Bøhn
authors.forename: Gunnar S
authors.initials: GS
authors.lastname: Simonsen
authors.forename: Arnfinn
authors.initials: A
authors.lastname: Sundsfjord
authors.forename: Kaare M
authors.initials: KM
authors.lastname: Nielsen
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D000900:Anti-Bacterial Agents / Q000009:adverse effects / Q000378:metabolism; D024901:Drug Resistance, Multiple, Bacterial / Q000187:drug effects / Q000235:genetics*; D016984:Enterococcus faecium / Q000187:drug effects; D006020:Glycopeptides / Q000009:adverse effects / Q000378:metabolism; D006801:Humans; D011200:Poultry; D011201:Poultry Diseases / Q000188:drug therapy*; D012641:Selection, Genetic
chemical_list: D000900:Anti-Bacterial Agents; D006020:Glycopeptides; C016249:avoparcin