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The AIDS virus attacks a type of white blood cell called CD4+, which is used to combat diseases such as influenza.

CD4+ is Helper T Cells, also known as helper T cells or Th cells. There is a 4th leukocyte differentiation antigen on its surface that needs to be activated, so a ‘+’ sign is added.

cluster of differentiation antigens (CD), which are macroprotein molecules bound to the cell membrane, have 247 types (CD1 - CD247). Some antigens need to be activated, and there is a ‘+’ at the end.

There are red blood cells and white blood cells in the blood. Th......