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Sustained simian immunodeficiency virus (SIV) infection of the central nervous system (CNS) depends on macrophage-tropic (M-tropic) strains that are often easily neutralizable. The CNS is often thought of as an immunologically privileged site that fosters replication of M-tropic quasispecies. Yet, there are limited data addressing the intrathecal antibody response or the role of the humoral response, in general, to control M-tropic strains. We investigated the temporal course of the intrathecal fusion inhibitory activity against an M-tropic viral variant and found an inverse relationship between the magnitude of this neutralization and the prevalence of M-tropic populations. These studies suggest a role for the humoral response in the suppression of M-tropic viral species in the CNS in experimental SIV infection.

journal of virology

Intrathecal Humoral Responses Are Inversely Associated with the Frequency of Simian Immunodeficiency Virus Macrophage-Tropic Variants in the Central Nervous System