These cells pick up HIV as they regularly prowl the mucous membranes and deep tissues.When they travel to the lymph nodes, they unwittingly deliver the virus to a large concentration of T cells.

• 树突细胞在例行巡逻到黏膜与深层组织时，便与HIV勾搭上，等树突细胞到达淋巴结后，又会不经意地把这些HIV送到T细胞聚集的地方。