BIOG 1106 - Unit 4 Slides / slide 9

Slide 9 depicts different types of bacteria. You should be able to recognize staphylococci, streptococci, and bacilli. (The prefices staphlo means clusters, strepto means chain, and diplo means pairs.)

Color enhanced scanning electron micrograph (SEM) of the bacteria Streptococcus pneumoniae. S. pneumoniae is the most common cause of bacterial pneumonia and a leading cause of bacterial meningitis among the elderly. Pneumococcal infections are also common causes of sinusitis and otitis media in young children. SEM 50,000x at 35 mm. Credit: Dr. Gary Gaugler / Photo Researchers, Inc.	Streptococcus pneumoniae bacteria. Colored scanning electron micrograph (SEM) of Streptococcus pneumoniae bacteria (also known as S. pneumococcus), a cause of pneumonia. These Gram-positive rounded (cocci) bacteria often occur in short chains, as here. Although often found living harmlessly in the body, S. pneumoniae can produce dangerous opportunistic pneumonia infections, often as a complication of serious disease when the victim's immunity is compromised. Magnification: x16,000 at 35mm size. Credit: BSIP / Photo Researchers, Inc.	Bacteria: Streptococcus pyogenes. Colored scanning electron micrograph. These gram-positive bacteria are rounded or spherical cocci. They typically form chains of cells, as seen here. Healthy humans may carry these bacteria harmlessly in their throat or nose. Phatogenicstrains of s. pyogenes, however, cause infections of the skin (including impetigo), the uterus following childbirth (puerperal sepsis), and the bloodstream (septicaaemia). S. pyogenes accounts for the high incidence of sore throats, tonsillitis, and middle ear infections (otitis media) in children. Treatment is with penniciline-drugs. Credit: Eye of Science / Photo Researchers, Inc.
Color enhanced scanning electron micrograph (SEM) of the bacteria Staphylococcus aureus. S. aureus is a spherical bacterium that occurs in pairs, short chains, or grape-like clusters. Staphylococcal food poisoning is caused by enterotoxins that some strains of S. aureus produce. The most common symptoms are nausea, vomiting, and abdominal cramping that occur hours after eating contaminated food. Recovery from food poisoning takes about 2 days. SEM 75,000x at 35 mm. Credit: Dr. Gary Gaugler / Photo Researchers, Inc.	Color ehanced scanning electron micrograph depicting Gram-positive Staphylococcus aureus bacteria. S. aureus, often referred to simply as 'staph,' are bacteria commonly carried on the skin or in the nose of healthy people. Staph bacteria are one of the most common causes of skin infections in the United States. Credit: Science Source / Photo Researchers, Inc.	Food poisoning bacteria. Colored scanning electron micrograph (SEM) of Enterococcus sp. bacteria on the surface of a sausage. Species of Enterococcus were previously known as Streptococcus. The bacteria (green) are spherical cocci and appear in pairs known as diplococci. They are seen on a background of sausage meat. Meat contaminated with Enterococcus sp. can cause food poisoning in humans. Some Enterococcus sp. are a normal inhabitant of the human intestine, but can also cause urinary tract infections and invade wounds or ulcers on the skin. They show resistance to some types of antibiotics. Magnification: x7, 600 at 6x7cm size. Magnification: x26, 000 at 10x8 inch print size. Credit: Dr Kari Lounatmaa / Photo Researchers, Inc.