‘THE WALTER AND ELIZA HALL INSTITUTE OF MEDICAL RESEARCH PoOsTAL ADDRESS: POST OFFICE, ROYAL MELBOURNE HOSPITAL, VICTORIA, 3050, AUSTRALIA. TELEPHONE 347.1511 AFFILIATED WITH ¢ THE UNIVERSITY OF MELBOURNE AND DIRECTOR: PROFESSOR G. J. V. NOSSAL, C.B.E., F.A.A. THE ROYAL MELBOURNE HOSPITAL March 6th, 1975, Professor J. Lederberg, Department of Genetics, Stanford University Medical School, Palo Alto, California 94304, U.S.A. Dear Josh, Enclosed you will see Bob Endean's reply concerning Beneckea group microorganisms. You will see, once again, that there is nothing really relevant to possible human infections coming forward. With all best wishes, G.J.VJ Nossal, Enc.