BIOG 1106 - Unit 4 Slides / slide 19

 

Slide 19.	Streptococcus bacteria. Colored scanning electron micrograph of Streptococcus pneumoniae (yellow) on cilia (brown), lining the surface of a lung. These Gram-positive oval-shaped bacteria also known as S. pneumococcus, often occur in short chains. Although found living harmlessly in the body, S. pneumoniae can cause dangerous opportunistic pneumonia infections, often as a complication of serious disease when the victim's immunity is compromised. Magnification unknown. Credit: SPL / Photo Researchers, Inc.	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 Credit: CANR, B. Dowsett / Photo Researchers, Inc.