infections during pregnancy; another to the first results of experimental therapy especial­ ly regarding the immune system. The immunological aspects not only of schizophrenia but also of depression, anxiety disorders, sleep and headache were also discussed at the meeting, and two further chapters cover methodological aspects related to clinical and experimental pitfalls in psychoneuroimmunology. The psychoneuroimmunology of psychiatric disorders is a rapidly expanding field, and research is increasing on the therapeutic aspects. This is reflected by one of the main themes of the "4th Expert Meeting in Psychoneuroimmunology", jointly held in autumn 1998 in Bethesda, Maryland, USA, with the Stanley Foundation Meeting in Neurovirology, devoted to therapeutic strategies deriving from psychoneuroimmunolo­ gical findings. The "5th Expert Meeting in Psychoneuroimmunology" will be held in 1999 in Innsbruck, Austria.