bild

Tissue sample in biohazard bag. Sample of human tissue being transported in a biohazard bag for analysis by a pathologist. Tissue from the sample will be examined under a light microscope in an attempt to diagnose the condition. The international biohazard symbol (top) warns of a potential biological hazard. This symbol is used where biologically active agents and fluids may be present. (KEYSTONE/SCIENCE PHOTO LIBRARY/MASSIMO BREGA, THE LIGHTHOUSE/SCIENCE PHOTO LIBRARY)