title: Antimicrobial resistance and virulence: a successful or deleterious association in the bacterial world?
abstract: Hosts and bacteria have coevolved over millions of years, during which pathogenic bacteria have modified their virulence mechanisms to adapt to host defense systems. Although the spread of pathogens has been hindered by the discovery and widespread use of antimicrobial agents, antimicrobial resistance has increased globally. The emergence of resistant bacteria has accelerated in recent years, mainly as a result of increased selective pressure. However, although antimicrobial resistance and bacterial virulence have developed on different timescales, they share some common characteristics. This review considers how bacterial virulence and fitness are affected by antibiotic resistance and also how the relationship between virulence and resistance is affected by different genetic mechanisms (e.g., coselection and compensatory mutations) and by the most prevalent global responses. The interplay between these factors and the associated biological costs depend on four main factors: the bacterial species involved, virulence and resistance mechanisms, the ecological niche, and the host. The development of new strategies involving new antimicrobials or nonantimicrobial compounds and of novel diagnostic methods that focus on high-risk clones and rapid tests to detect virulence markers may help to resolve the increasing problem of the association between virulence and resistance, which is becoming more beneficial for pathogenic bacteria.
authors.affiliation: Servicio de Microbiología, Complejo Hospitalario Universitario A Coruña-INIBIC, A Coruña, Spain.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Beceiro
authors.forename: María
authors.initials: M
authors.lastname: Tomás
authors.forename: Germán
authors.initials: G
authors.lastname: Bou
mesh_terms: D001419:Bacteria / Q000187:drug effects* / Q000472:pathogenicity*; D001424:Bacterial Infections / Q000453:epidemiology* / Q000382:microbiology*; D024881:Drug Resistance, Bacterial; D019143:Evolution, Molecular; D006801:Humans; D015995:Prevalence; D012641:Selection, Genetic; D014774:Virulence; D037521:Virulence Factors / Q000378:metabolism*
chemical_list: D037521:Virulence Factors
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