5. ConclusionThe percentage of virus-specific T cells was found to be increased in the decidua basalis and decidua parietalis, suggesting an accumulation of memory T cells in the placenta to protect the fetus from a harmful infection. The list of tetrameric complexes used in this study does not cover the total number of possible specificities of the memory T cells found in either the peripheral blood or the decidual tissue. More extensive studies including more virus-specific T cells are necessary to establish their role in uncomplicated pregnancy and in pregnancy complications.