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AIDS Research and Human Retroviruses
Enfuvirtide Is Active against HIV Type 1 Group O

To cite this article:
Eva Poveda, Pablo Barreiro, Berta Rodés, Vincent Soriano. AIDS Research and Human Retroviruses. June 2005, 21(6): 583-585. doi:10.1089/aid.2005.21.583.

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Eva Poveda
Department of Infectious Diseases, Hospital Carlos III, Madrid, Spain.
Pablo Barreiro
Department of Infectious Diseases, Hospital Carlos III, Madrid, Spain.
Berta Rodés
Department of Infectious Diseases, Hospital Carlos III, Madrid, Spain.
Vincent Soriano
Department of Infectious Diseases, Hospital Carlos III, Madrid, Spain.

A high diversity within the HR1/HR2 regions of viral gp41 and one natural change (N42D) within the 36–45 aa domain in HIV-1 group O in comparison with HIV-1 group M isolates have led us to suspect that enfuvirtide (ENF) should not be active against HIV-1 group O. We analyzed in vitro and in vivo the antiviral activity of ENF against HIV-1 group O isolates. The IC50 at baseline was 0.15 ± 0.028 µg/ml in a clinically derived virus specimen. After initiating treatment with ENF, a significant decline in plasma HIV-RNA and CD4 gain was noticed in one patient. Therefore, individuals with HIV-1 group O strains might benefit from ENF therapy.

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