Development of diphtheria and scarlet fever vaccines Correspondence between Dr McSweeney and Dr Richard Alfred O'Brien of the Wellcome Research Laboratories regarding the development of diphtheria and scarlet fever vaccines. Specific topics evident in the letters include trials of formal-toxoid and other forms of diphtheria prophylactic, the Schtick, Moloney, Mantoux, and Dick tests, and the preparation of Alum Precipitated Toxoid for human injection. 1933-1935