So how many types of T-cells are there? I searched it up and the results were varied: some websites said that there were 2 types, a couple said that there were 3, and others said that there were 4.
Flixwito got em right. The main two in the cell-mediated immune response are Helper T cells and Killer T cells (also known as "Cytotoxic T cells"). There may be confusion in the different subtypes of T cells; for example there are TH1, TH2 and TH17 subtypes of Helper T cell.
