“O. U., 2 December 1943
“To Standartenfuehrer Dr. Mrugowsky,
“Head of the Hygiene Institute of the Waffen SS
“Berlin-Zehlendorf 6
“Spanische Allee 10
“Dear Herr Mrugowsky:
“At present I have at my disposal a number of samples of a new murine virus typhus vaccine which was prepared from mice livers and proved in animal experiments to be quantitatively a thousand times more effective than the vaccine prepared from mice lungs. In order to decide whether this first-rate murine vaccine should be used for protective vaccination of human beings against lice typhus, it would be desirable to know if this vaccine showed in yours and Ding’s experimental arrangement at Buchenwald an effect similar to that of the classic virus vaccines. Would you be able to have such an experimental series carried out? Unfortunately, I could not reach you over the phone. Considering the slowness of postal communications I would be grateful for an answer by telephone. My numbers, all of which go through the same switchboard, are: Berlin 278313; Rapid Exchange Berlin 90, Zossen 559; Luftwaffe Exchange 72, there you ask for RLM, L In 14.
“With best regards
“Heil Hitler!
“Yours