EXECUTIVE ORDER 10399:
September 27, 1952
DESIGNATING THE SURGEON GENERAL OF THE PUBLIC HEALTH SERVICE TO PERFORM CERTAIN DUTIES UNDER THE INTERNATIONAL SANITARY REGULATIONS (WORLD HEALTH ORGANIZATION REGULATIONS NO. 2)
“undertakes to give effect to regulations of the World Health Assembly concerning sanitary and quarantine requirements and other procedures designed to prevent the international spread of disease, as to which the said governments have not entered an unacceptable reservation or a rejection; and”
https://www.trumanlibrary.gov/library/executive-orders/10399/executive-order-10399
This occurred in the last few months of his second term, and just 2 months before he was secretly hospitalized for a life-threatening infection.
“The President is Very Acutely Ill”
Harry S. Truman’s Illness of July 1952
After a Sunday, July 13, meeting in which Truman and his political inner circle agreed to support Vice President Alben Barkley for the nomination (which ultimately went to Governor Adlai Stevenson of Illinois), the President experienced a “nervous chill” and sent for his doctor, Gen. Wallace Graham. He then called his daughter, Margaret, in London and his wife, Bess, in Independence, speaking with them on a three-way connection. Truman’s body temperature reached 103.6 degrees that day, and on the following day, July 14, he was taken to Walter Reed Army Hospital for tests and observation. At Walter Reed, the President reported being “stuck . . . full of holes,” being given pills, and having a lot of blood taken for examination. Bess then arrived and “took charge” of his care. By his own account, the President mostly slept for 48 hours. And that is all that we knew about the story for almost 60 years.
https://www.archives.gov/publications/prologue/2012/fall/truman-ill.html
THE FIRST TEN YEARS OF THE WORLD HEALTH ORGANIZATION:
The International Sanitary Conferences:
https://apps.who.int/iris/bitstream/handle/10665/37089/a38153_eng_LR_part1.pdf
INTERNATIONAL HEALTH ADMINISTRATION
Ex. Ord. No. 10399, Sept. 27, 1952, 17 F.R. 8648, designated Surgeon General to perform certain duties under International Sanitary Regulations of World Health Organization.
h/t Anon Braveheart