This interesting volume is the result of a proper symposium rather than a collection of submitted reports. The authoritative findings are sprinkled generously with a free flowing discussion which brings sharply into focus what remains to be learned and how to go about it. The 22 well-qualified participants include 17 from Great Britain, 4 from the European continent, and 1 from the United States. Wisely included are the observations of a veterinarian-scientist; lessons learned from studies made primarily to prevent economic losses in animals may become useful to clinicians.
