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

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.