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Intertype cross-neutralization of HIV-2 pseudoviruses by plasma from HIV-1-infected subjects (n = 24) and neutralization of HIV-1 pseudoviruses by plasma from HIV-2-infected subjects (n = 24). There was no significant difference in the proportions of HIV-1- and HIV-2-infected subjects, demonstrating positive neutralization against intertype viruses (P = 0.195).
