High levels of IL-4 have been correlated to a delay in viral clearance of SARS-CoV-2 (62), however, low levels of this cytokine were also associated with long COVID-19 (63), accentuating the importance of a balance between Th1/Th2 axis for the establishment of an effective immune response against SARS-CoV-2. The gene discussed is IL4; the disease is COVID-19.