The chorion cells may produce MCP-1, IP-10, RANTES, and MIP-1β to recruit maternal circulating monocyte and IL-6, TNF-α, and IFN-β to differentiate the recruited maternal monocytes and the staying fetal amnion mesenchymal cells [80] to macrophages as scavengers for huge numbers of corpses of neutrophils and massive number of corpses of chorion cell themselves resulting from apoptosis induced by the virus infection. The gene discussed is IL6; the disease is viral infectious disease.