CD40LG and infection: Of these, 8 samples belonged to panel 1 (6 HCMV IgM positive with low IgG avidity and 2 HCMV IgM negative with high IgG avidity), and 17 belonged to panel 2 (12 serum samples from 8 patients with HCMV primary infection, 3 serum samples from 2 patients with HCMV secondary infection, and 2 samples from a single patient with T. gondii primary infection).