CD40LG and COVID-19: The Jonckheere test showed a significant trend in the IgM and IgG index data, revealing that in COVID-19 cases the median IgM and IgG index values move in the same direction with the disease duration (IgM index value: J=781.5, Z=2.88, r=0.36; IgG index value: J=654, Z=1.16, r=0.15).