This meeting included talks which covered both the principles and problems of vaccine development and others that extensively reviewed the present state of progress towards the goal of antigenically defined parasite vaccines for human and veterinary use. Several speakers, particularly Drs Morrison and Gutteridge, pointed out that in comparison with bacteria and viruses there are few vaccines available against parasites and these consist of attenuated organisms for veterinary infections. Therefore, despite the intensity of effort, better defined vaccines for parasites still elude us.