<prompt> CD4 count refers toT helper cellsB cellsCytotoxic cellsBoth B And T Cells  <response>: Helper T-cells CD4 positive. o Cytotoxic T-cells and suppressor T-cells CD 8 positive,Based on function CD4 helper T cells are divided into1. Effector CP4 helper T-cellsFunctions are- A.By TH1 cellsi. Activate macrophagesii. Delayed hypersensitivityiii. Cell-mediated immunityiv. The killing of intracellular microbes. e.g. tuberculosis and leprosyv. Destruction of target cells by.Activate CDS T cells to become cytotoxic cells. b. Activate NK cells B By TH2 celtsi Activate B cells to develop into anybody producing plasma cells facilitate the synthesis of antibodies.2. Memory CD4 helper T cells Retain the antigenic affinity of the originally activated T cells and are used to act as later effector cells during a second immune response. 