Abstract
Received for publication October 3, 1966. These studies were supported in part by U. S. Public Health Service Fellowship 5-F3-AI20,002 and by grant AI-04997 from the U. S. Public Health Service. Published with the approval of the Director of the Wisconsin Agricultural Experiment Station as paper NS 492. * Present address: Southeast Poultry Research Laboratory, Agricultural Research Service, U. S. Department of Agriculture, 934 College Station Road, Athens, Georgia 30601. METHODS
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