On the other hand, T cells from the maternal SARS+ group responded poorly to polyclonal stimulation, indicated by the dampened secretion of Th1 cytokines (IFN-γ, GM-CSF), Th2 cytokines (IL-5, IL-13), and cytotoxic (GZMB) mediators (Figure 3C). Here, CSF2 is linked to severe acute respiratory syndrome.