title: Neutralization susceptibility of B subtype variant B" primary HIV-1 isolates. The HEC/FIOCRUZ AIDS Clinical Research Group.
abstract: Susceptibility to autologous and heterologous neutralization of primary human immunodeficiency virus (HIV)-1 isolates belonging to subtype B, to the B"-variant of subtype B or to subtype F from infected individuals residing in Rio de Janeiro was assayed. A lower infectivity of the B"- and F isolates when compared to the classical B-subtype HIV-1 isolates was observed. Comparisons of neutralization susceptibilities were carried out for 19 B-subtype, 11 B"-variant and two F-subtype HIV-1 isolates with plasma from autologous and heterologous samples. Frequency of autologous neutralization was slightly lower for B-subtype isolates in comparison to B"-variant isolates. Heterologous intra-subtype neutralization was significantly lower for B-subtype than for the B"-variant or the F-subtype isolates. While B-subtype isolates were neutralized by most anti-F-subtype plasma, F-subtype isolates, although most susceptible to F-subtype antibodies, were highly susceptible to neutralization by anti-B-subtype antibodies. Cross-neutralization for B"-variant and B-subtype isolates was not as extensive as observed for B- and F-subtype isolates. However, the results presented indicate a quite extensive cross-neutralization between Brazilian HIV-1 isolates.
authors.affiliation: Department of Immunology, IOC, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil.
authors.forename: V
authors.initials: V
authors.lastname: Bongertz
authors.forename: C I
authors.initials: CI
authors.lastname: Costa
authors.forename: M L
authors.initials: ML
authors.lastname: Guimarães
authors.forename: B
authors.initials: B
authors.lastname: Grinsztejn
authors.forename: E C
authors.initials: EC
authors.lastname: João Filho
authors.forename: B
authors.initials: B
authors.lastname: Galvão-Castro
authors.forename: M G
authors.initials: MG
authors.lastname: Morgado
mesh_terms: D000940:Antigenic Variation; D015483:HIV Antibodies / Q000276:immunology; D015488:HIV Antigens / Q000276:immunology*; D015497:HIV-1 / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D009500:Neutralization Tests
chemical_list: D015483:HIV Antibodies; D015488:HIV Antigens