CD40LG and COVID-19: Bivariate analysis results suggested four readily available laboratory parameters and imaging studies that may be used to predict COVID-19 in asymptomatic patients—NLR, CRP level, presence of SARS-CoV-2–IgM antibody, and typical findings on chest x-ray—even though most subjects had lymphocyte counts ≥ 1,500 cells/mm3 (57.1%), NLR ≥ 2.4 (62.5%), CRP levels < 10 mg/L (62.2%), a negative SARS-CoV-2–IgM antibody serology test result (96.9%), and a normal/atypical chest x-ray (88.2%).