title: Stability of transmitted drug-resistant HIV-1 species.
abstract: OBJECTIVE
  The proportion of patients showing primary infection with HIV-1 that are already resistant to antiviral drugs has been steadily increasing. Such resistance is known to compromise therapy response. Most patients, however, are not diagnosed during their incident infection and, until recently, it was not known for how long resistant virus can be detected following infection. This article reviews reports on the stability of transmitted resistance in the absence of therapy.
  
  
  RESULTS
  It has now been shown that many resistance-associated mutations can persist for a considerable time following transmission in the absence of treatment and that such resistance can be further transmitted.
  
  
  CONCLUSIONS
  Since transmitted resistance can be detected years after infection, it is now worthwhile carrying out resistance tests on newly diagnosed patients in which it is known that the level of transmitted resistance in the population warrants such testing.
authors.affiliation: Centre for Infection, Health Protection Agency, Porton Down, Salisbury SP4 0JG, UK. pat.cane@hpa.org.uk
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Cane
mesh_terms: D019380:Anti-HIV Agents / Q000494:pharmacology*; D024882:Drug Resistance, Viral; D015658:HIV Infections / Q000188:drug therapy / Q000635:transmission* / Q000821:virology; D017320:HIV Protease Inhibitors / Q000494:pharmacology*; D015497:HIV-1 / Q000187:drug effects* / Q000235:genetics; D006801:Humans; D009154:Mutation; D018894:Reverse Transcriptase Inhibitors / Q000494:pharmacology*
chemical_list: D019380:Anti-HIV Agents; D017320:HIV Protease Inhibitors; D018894:Reverse Transcriptase Inhibitors