Telephone ; 01-435 2232 Telegrams : MEDRESLAB, LONDON, N.W.3 MEDICAL RESEARCH COUNCIL NATIONAL INSTITUTE FOR MEDICAL RESEARCH, (HAMPSTEAD LABORATORIES), HOLLY HILL, LONDON, N.W.3. 16th July 1968 Professor Joshua Lederberg Department of Genetics Stanford Medical Center 300 Pasteur Drive PALO ALTO California Dear Professor Lederberg, Thank you for your letter enquiring about the outbreak of severe haemorrhagic disease in vervet monkeys, written up in the Lancet on 25th November 1967. Whilst it is true that the Permanent Section of Microbiological Standardisation wrote a brief report shortly after the outbreak for the purposes of inform- ing their membership, this report is so out of date that we have ceased distribution, I think it is important for you to refer to the original authentic reports of the outbreak of this disease, which is covered by the issue of "Deutsche Medizinische Wochenschrift", dated 26th March 1968. Although these reports are in German there are English summaries at the back of the journal, I am sorry to be so negative in this respect, but the original interim report may now be misleading to you. Yours sincerely, uch cloihat FEF, I, Perkins