Fever of un-Swiss origin.

Lebowitz D Geneva university hospitals, division of general internal medicine, 1205 Geneva, Switzerland. Electronic address: dan.lebowitz@hcuge.ch.
Celi L Geneva university hospitals, division of general internal medicine, 1205 Geneva, Switzerland.
Tshikung ON Geneva university hospitals, division of infectious diseases, 1205 Geneva, Switzerland.
Starobinski M Geneva university hospitals, division of hematology, 1205 Geneva, Switzerland.
Chappuis F Geneva university hospitals, division of tropical and humanitarian medicine, 1205 Geneva, Switzerland.
Serratrice J Geneva university hospitals, division of general internal medicine, 1205 Geneva, Switzerland.