A symposium seems an appropriate vehicle to review recent, as well as new, data on important topics. It is therefore our goal to present a symposium on selected topics of importance every three years. Some topics will be updated and new topics will be presented. A vast amount of information has been accumulated over the past ten years on the significance of anaerobic bacteria in infectious diseases. This symposium was organized to discuss laboratory aspects, normal flora, pathogenicity, serology, and the patients' immune re sponse to anaerobic infection. Important imformation on the patients'...