(a) round (cocci)Lancet Shaped – S. pneumoniaeCoffee bean/kidney bean shaped – N. Gonorrhea(b)rectangular or rod shaped (bacilli)(c)curved and spiral shape (spirilla)
(a) The round-shaped bacteria, also known as cocci, can have different specific shapes
(a) The round-shaped bacteria, also known as cocci, can have different specific shapes. One of these shapes is lancet-shaped, which is typically seen in Streptococcus pneumoniae. This bacteria resembles a small, elongated oval with pointed ends, resembling the shape of a lancet. Streptococcus pneumoniae is a bacterium that commonly causes respiratory infections such as pneumonia, as well as other invasive diseases.
Another shape seen in cocci bacteria is the coffee bean or kidney bean shape, which is typically observed in Neisseria gonorrhoeae. This type of bacteria appears as a round or oval-shaped cell with slightly flattened sides, resembling the shape of a coffee bean or kidney bean. Neisseria gonorrhoeae is the bacterium responsible for the sexually transmitted infection gonorrhea, which primarily affects the genital tract but can also cause infections in other parts of the body.
(b) Rectangular or rod-shaped bacteria, also known as bacilli, are characterized by their elongated and cylindrical shape. These bacteria generally appear as rectangular or rod-like cells. Examples of rod-shaped bacteria include Escherichia coli, which is a common bacterium found in the intestines of humans and animals, playing a crucial role in digestion, and Bacillus anthracis, the causative agent of the disease anthrax.
(c) Curved and spiral-shaped bacteria are known as spirilla. These bacteria have a distinctive curved or spiral shape, giving them a helical appearance. One example of a curved bacteria is Vibrio cholerae, the causative agent of cholera, which appears as a curved rod with a comma-like shape. Another example is Campylobacter jejuni, a bacterium commonly associated with foodborne infections, which has a spiral shape resembling a corkscrew.
These different shapes of bacteria are characteristics that help distinguish and classify them in the field of microbiology. Understanding the shape and characteristics of bacteria is essential for their identification, diagnosis of infections, and development of targeted treatments.
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