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In two cases of parenteral transmission of human immunodeficiency virus type 1 (HIV-1) syncitium-inducing (SI) variants, we previously observed selection for macrophagetropic variants. Although infection of macrophages is generally mediated via CCR5, we found no selection for SI variants that could use CCR5 as coreceptor in addition to CXCR4, suggesting that features other than coreceptor usage account for the macrophagetropism of these transmitted SI HIV-1 variants.

No Selection for CCR5 Coreceptor Usage during Parenteral Transmission of Macrophagetropic Syncytium-Inducing Human Immunodeficiency Virus Type 1