In Caucasians, HF patients showed a higher abundance of naïve CD4 T cells (P < 0.05 and FDR>0.05), naïve B cells, CD8 T cells, regulatory T cells, M1 macrophages, and resting dendritic cells, and a lower abundance of resting memory CD4 T cells, M2 macrophages, and eosinophils (P < 0.05 and FDR<0.05). The gene discussed is CD4; the disease is hydrops fetalis.