In the acute phase of HIV infection, the immune system combats the loss of CD4 T cells by producing as many as two billion new T cells a day. This is what model for T cell loss

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .