What is reproductive immunology?
There has been much debate about the role of a natural part of the immune system in pregnancy, including some cells, known as ‘NK cells’, or ‘natural killer cells’ that help the body fight disease. Some medical professionals believe that a woman’s immune system can occasionally react against sperm, preventing fertilisation, or against an embryo, which either stops the embryo from implanting, or rejects the embryo early on in pregnancy, resulting in a miscarriage. For more information, see Reproductive immunology.