hCG (human chorionic gonadotrophin) A hormone produced by the placenta during preg- nancy. Maintains the secretion of progesterone by the corpus luteum of the ovary. Hepatitis B or C Inflammation of the liver caused by viruses, toxic substances or immunological abnormalities.138 HIV Human immunodeficiency virus. Immunisation The production of immunity by artificial means through administration of a vaccine. Intracytoplasmic sperm injection (ICSI) A technique of assisted conception. Spermatazoa are extracted and injected into the cytosplasm of the egg and implanted into the uterus. Intrauterine insemination (IUI) Carefully washed spermatozoa are injected into the uterus through the vagina at the time of ovulation. Iso-immunisation The development of antibodies within an individual against antigens form another individual of the same species. Listeria Bacteria that are parasites of warm-blooded animals. Affecting many domestic and wild animals. Can be transmitted to humans by eating infected animals or their products.