Immunoglobulin (Ig) level was analyzed among rAAV2-hIL15- treated, rAAV2-vector-treated and mock groups. Sera obtained from these groups were examined, respectively. Quantification of immunoglobulin levels was measured via ELISA. hIL15, human interleukin 15; rAAV2, recombinant adeno-associated virus serotype 2; ELISA, enzyme-linked immunosorbent assay.