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Oct 7, 2023 · Cocci: Bacilli: Shape: Spherical, elliptical, oval: Cylindrical or Rod-shaped, curved, filamentous, spirochete, or spindle: Size: Variable Usually smaller than bacilli Typically 0.5 to 2.0 μm in diameter: Variable Usually larger than cocci Typically 1.0 to 4.0 μm in length: Arrangement: May be single, diplococci, streptococci, staphylococci ...
Aug 31, 2023 · Learning Objectives. List the three basic shapes of bacteria. List and describe 5 different arrangements of cocci. Define and give the abbreviation for the metric unit of length termed micrometer and state the average size of a coccus-shaped bacterium and a rod-shaped bacterium. List and describe 2 different arrangements of bacilli.
Jan 17, 2021 · Escherichia coli (E. coli) is a gram-negative bacillus known to be a part of normal intestinal flora but can also be the cause of intestinal and extraintestinal illness in humans. There are hundreds of identified E. coli strains, resulting in a spectrum of disease from mild, self-limited gastroenteritis to renal failure and septic shock.
- Matthew Mueller, Christopher R. Tainter
- 2023/07/13
E. coli is a gram-negative, facultative anaerobe, nonsporulating coliform bacterium. Cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter, with a cell volume of 0.6–0.7 μm 3. E. coli stains gram-negative because its cell wall is composed of a thin peptidoglycan layer and an
- Staphylococcus
- Streptococcus
- Bacillus
- Clostridium
- Listeria monocytogenes
- Corynebacterium diphtheriae
Staphylococci are commonly responsible for bacterial infections. Most cases are caused by the following species. Other pathogenic staphylococci are less common and rarely lead to disease.
Streptococci bacteria are also common pathogenic bacteria. The following organisms are the most prevalent. In general, other streptococci groups may cause foodborne illnesses with a sore throat.
As spore-forming bacteria, bacilli make spores that release toxins. Most bacilli aren’t pathogenic to humans, but the following two can cause severe medical conditions.
About 30 Clostridiaspecies cause disease in humans. Like bacilli, these bacteria form toxins that lead to serious conditions. Clostridiaare usually involved with foodborne illnesses, but the most concerning bacteria include:
The only pathogenic Listeria bacteria is L. monocytogenes. In healthy people, it typically causes mild symptoms of foodborne illness. But in people with weakened immune systems, the bacterium can cause life-threatening conditions like: 1. meningitis 2. septicemia 3. listeriosis
There are about 30 Corynebacterium bacteria associated with human disease. However, these organisms rarely cause sickness and usually affect people with compromised immune systems. C. diphtheriais the primary pathogenic organism in this group. It’s responsible for: 1. diphtheria 2. pharyngitis 3. respiratory infections 4. septic arthritis 5. cutane...
Apr 13, 2016 · Common shapes seen on the Gram stain include cocci, which resemble spheres; bacilli, which resemble rods; or coccobacilli, which are a combination of the two. Cocci can be arranged in patterns, such as clusters or chains; for example, Staphylococcus species appear as gram-positive cocci in clusters.
May 24, 2021 · The cocci come in 5 different arrangements; the bacilli in 3 different arrangements; and the spirals in 3 different forms. 1. Coccus. A coccus-shaped bacterium is usually spherical, although some appear oval, elongated, or flattened on one side.
