To examine the effect of hMPV infection on CAMP expression in human macrophages, we infected human monocyte-derived macrophages (MDMs) with hMPV at MOI 1, in the presence or absence of 100 nM of VD3 (the precursor form of vitamin D), 25(OH)D3 (circulating vitamin D), or 1,25(OH)2D3 (active vitamin D). This evidence concerns the gene CAMP and infection.