We start this lesson with a tip, i.e. words ending in -us commonly form their plural by dropping the -us and adding -i. Thus, nucleus becomes nuclei and coccus becomes cocci (KOK-si).
A Streptococcus is a beery-shaped bacterium that grows in twisted chains. One group of streptococci are responsible for such conditions as "strep" throat, tonsilitis, rheumatic fever, and certain kidney ailments, whereas another group cause infections in teeth, in the sinuses (cavities) of nose and face, and sometimes in the valves of the heart.
The genus streptococcus is comprised of gram-positive, microaerophilic cocci (round), which are not motile and occur in chains or pairs. The genus is defined by a combination of antigenic, hemolytic, and physiological characteristics into groups a, b, c, d, f, and g. groups a and d can be transmitted to humans via food.
A Staphylococcus is a bacterium that grows in small clusters, like grapes. Staphylococcal lesions may be external (skin abscesss, boils, and styes) or internal (abscesses in bone and kidney). (An abscess is a collection of pus, white cells, and protein that is present at the site of infection).
The Staphylococcus is a genus of spherical bacteria of the family micrococcaceae, the best known species of which are universally present in great numbers on the mucous membranes and skin of humans and other warm-blooded animals. The term staphylococcus, generally used for all the species, refers to the cells' habit of aggregating in grapelike clusters.
In the next lesson, we will learn about BLOOD CELLS..ok
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