claim: reappearance of effector t cells predicts successful recovery from covid-19
evidence_1: understanding t cell-responses in the context of clinical severity might serve as foundation to overcome the lack of effective anti-viral immune response in severely affected covid-19 patients and can offer prognostic value as biomarker for disease outcome and control.", "follow up samples revealed a marked increase in effector t cells and memory subsets in convalescing but not in non-convalescing patients.")