In 1943 the impact on inmates of Wirths' actions at Auschwitz resulted in him receiving a Christmas card from Langbein, a political prisoner who worked with him, which contained the message “In the past year you have saved here the lives of 93,000 people. We do not have the right to tell you our wishes. But we wish for ourselves that you stay here in the coming year.” It was signed: “One speaking for the prisoners of Auschwitz.” The figure of 93,000 was the difference in mortality rate among prisoners from typhus in the year prior to Wirths' arrival.