EDELMANN / SCIENCE PHOTO LIBRARY EDELMANN / SCIENCE PHOTO LIBRARY
HIV virus infecting a cell. Coloured Transmission Electron Micrograph (TEM) of an HIV virus in the process of penetrating a T-lymphocyte human blood cell. HIV (Human Immunodeficiency Virus) is the virus responsible for AIDS. At upper left, the virus (orange) is free-floating. Clockwise, the sequence shows the virus landing on a T-cell (white) and penetrating the cell membrane to lower left. T-cells are involved in the body's immune response. By infecting these cells, HIV can form new viruses. When they bud out of the cell to float free in the blood, the T-cell is damaged and the body's immune system is weakened.
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