I went to China in 1952 wanting to assess the assertions of germ warfare being one reason. Without going into the evidence, I came away convinced that Chinese officials believed that the evidence was conclusive. On returning, Alan Watt, my successor as permanent head of the Australian Department of External Affairs, informed me that in the light of my public statements he had sought a response from Washington and was informed that the United States had used biological weapons during the Korean war but only for experimental purposes.
óDr. John Burton, letter of 12 April 1997