Among other clinical features in severe COVID-19 patients are lymphopenia, thrombocytopenia, and a raise of inflammatory markers such as C-reactive protein (CRP), increased D-dimer, lactate dehydrogenase (LDH), and proinflammatory cytokines (Costela-Ruiz and others 2020; Guan and others 2020; Huang and others 2020; Mason 2020; Tang and others 2020a). Here, CRP is linked to lymphopenia.