IL13 and COVID-19: The presence of critical COVID-19 (OR 6.666 [95% CI 1.886–34.481], P=0.002) and serum levels of IL-13 (pg/mL) OR 0.978 [95% CI 0.957-0.997], P=0.028) were the explanatory features of a sustained humoral immune response 6 months after recruitment.