Introduction: Primary bacterial infection of an artery is difficult to diag
nose, especially at the beginning of the illness. Most of the patients come
for emergency treatment in the phase of rupture. Methods: The course of il
lness in four patients serves as background for discussion of the problems
of diagnosis and therapy. Results: Bacterial infection of arteries shows a
high rate of complications and, for the aorta, high mortality. Conclusion:
If fever of uncertain origin is combined with pain of the stomach or of the
back, or with a painful reddish swelling on a limb, this rare disease shou
ld be considered in the differential diagnosis.