Provides an overview of the effects of environmentally and occupationally important metals on the immune system and host defence. The fist ten chapters in the text focus on particular metals or groups of metals, including arsenic, beryllium, cadmium, chromium, lead, mercury, nickel and vanadium. Subsequent chapters examine the immunotoxicological effects of trace metals such as indium and platinum and essential metals such as iron, zinc and copper. The main emphasis is on the in vivo and in vitro effects of these metals on host immune responses in a variety of mammalian species including humans. Each chapter also briefly reviews the history, use, occurrence, biology and toxicology of the metals.