CD40LG and rubella: Laboratory studies showed negative/non-reactive results for antinuclear antibodies; hepatitis A, B, and C antigens; rheumatoid factor; erythrocyte sedimentation rate; C-reactive protein; human immunodeficiency virus; measles, mumps, and rubella (titers); anti-double-stranded deoxyribonucleic acid (anti-DNA); and syphilis. However, positive results were seen for anticardiolipin antibody (AB), IgM, and ferritin, which were elevated. Additionally, varicella-zoster AB, IgM levels were elevated (Table 1).