Another case report described three patients with COVID-19 who were readmitted in March 2020 to a hospital in Wuhan, China, after having recovered with positive SARS-CoV-2 IgG antibody, negative SARS-CoV-2 RT-PCR and negative SARS-CoV-2 IgM antibody tests.290. Here, CD40LG is linked to COVID-19.