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Macaques which developed high-titer neutralizing antibodies (htNAb) after immunization with a virion-derived oligomeric envelope glycoprotein subunit vaccine were protected against a homologous simian immunodeficiency virus SIVmac challenge. Here we demonstrate that the htNAb could be overcome by V1-env region variants isolated ex vivo from an SIVmac-infected macaque. The results further suggest that the development of V1-env region neutralization escape mutants is also necessary for survival of the virus in infected macaques. The immunological capacity of a single variable region to induce neutralizing antibodies in vaccinated and infected macaques initiate new ideas for a successful vaccine strategy.

journal of virology

Naturally Occurring V1- <i>env</i> Region Variants Mediate Simian Immunodeficiency Virus SIVmac Escape from High-Titer Neutralizing Antibodies Induced by a Protective Subunit Vaccine

Naturally Occurring V1- env Region Variants Mediate Simian Immunodeficiency Virus SIVmac Escape from High-Titer Neutralizing Antibodies Induced by a Protective Subunit Vaccine