HIV Invades Healthy Vaginal Skin Cells (IMAGE) Northwestern University Caption This illustration shows how the HIV virus slips between loosely connected skin cells to reach its immune cell targets such as the Langerhans cells (orange), macrophages (purple), dendritic cells (green) and CD4 positive T cells (blue). Credit Ann Carias Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.