CD209 and infection: When we studied the impact of these liposomes on HIV-1 X4 (1) and HIV-1 R5 (2) trans-infection mediated by DC-SIGN, we observed that papA1Δ liposomes only decreased virus capture-transfer by 1.1-fold for HIV-1 X4 (p-value = 0.0053) and 1.2-fold for HIV-1 R5 (p-value = 0.0030) while H37Rv blocked trans-infection via DC-SIGN by 3.2-fold (p-value < 0.0001) for HIV-1 X4 and 3.1-fold (p-value < 0.0001) for HIV-1 R5.