Additionally, the positive correlation with SCF, a key cytokine for the self-renewal and maintenance of haematopoietic stem cells (HSCs)61 and prevention of lymphopenia, suggests that higher frequencies of Vδ1 T cells in the lungs during mild or asymptomatic infection is associated with better outcome to aerosol SARS-CoV-2 infection. The gene discussed is KITLG; the disease is lymphopenia.