Anthrax bacteria in lung. Colored scanning electron micrograph
(SEM) of a cluster of anthrax bacteria (Bacillus anthracis) in capillary
of the lung. These rod-shaped, Gram-positive bacteria are pathogenic.
Commonly an infection of livestock, B. anthracis is transmitted to
humans by contact with contaminated animal hair, hides, or excrement.
Two forms of the disease occur: pnumonia in the lungs (woolsorter's
disease), and cutaneous anthrax, which causes a large boil at the site
of the bacteria's entry. Antibiotic treatment, if prompt, may be
effective for the skin infection. Pulmonary anthrax is fatal in most
cases. Magnification: x540 at 6 x 7 size. x1750 at 7.5 x 9.5