Background: Increasingly, autologous blood transfusions are used in el
ective surgical procedures to avoid the risk of infection due to allog
eneic blood transfusion. Case Report: A 64-year-old patient had to und
ergo the implantation of a total right hip endoprosthesis. During the
transfusion of 1 unit of autologous packed red cells, the patient expe
rienced high temperature and shock, which necessitated his observation
in the intensive care unit for several days. Yersinia enterocolitica
(type O:9) was isolated from the packed red cells, from the unit of fr
esh-frozen plasma separated from the same donation, and from one blood
culture drawn from the patient. With appropriate therapy, the patient
recovered without sequelae. Conclusion: Although autologous blood tra
nsfusions are safe with respect to transmission of human immunodeficie
ncy virus or hepatitis B and C infections, the risk of bacterial septi
cemia remains.