title: A greater prevalence of X4 viruses in HIV type 1 intravenous drug users reflects a "CD4+ effect".
authors.forename: Laura
authors.initials: L
authors.lastname: Monno
authors.forename: Luigia
authors.initials: L
authors.lastname: Scudeller
authors.forename: Nicoletta
authors.initials: N
authors.lastname: Ladisa
authors.forename: Paolo
authors.initials: P
authors.lastname: Maggi
authors.forename: Gioacchino
authors.initials: G
authors.lastname: Angarano
mesh_terms: D000328:Adult; D018791:CD4 Lymphocyte Count; D005260:Female; D005500:Follow-Up Studies; D015658:HIV Infections / Q000150:complications / Q000453:epidemiology* / Q000276:immunology / Q000821:virology; D015497:HIV-1 / Q000145:classification / Q000472:pathogenicity* / Q000502:physiology; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D015819:Substance Abuse, Intravenous / Q000150:complications / Q000453:epidemiology / Q000821:virology*; D056189:Viral Tropism