CD40LG and Decreased total leukocyte count: A study that included 98 PVB19-infected adult transplant recipients reported higher positive rates of PVB19 IgM (71.2%) and IgG (38%), but lower incidences of thrombopenia (21.2%), leukopenia (37.3%) and graft dysfunctions (10.4%) than the pediatric recipients in our study [5], indicating a less immunocompetent state and a greater damage on hematopoietic cell lines of the pediatric recipients.