aureus) that are resistant to methicillin. MRSA refers to particular strains of gram-positive bacteria Staphylococcus aureus (S. These spherical or elongated coccoid organisms are found in the normal rumen of cattle and sheep and in the intestinal tract of rabbits. Additionally, a number of bacterial taxa (viz. These belong to the class Mollicutes (alternatively considered a class of the phylum Tenericutes), which lack peptidoglycan (gram-indeterminate), and the class Negativicutes, which includes Selenomonas and stain gram-negative. Some Firmicute species are not gram-positive. Bacteria are categorized based on their shapes into three classes: cocci (spherical-shaped), bacillus (rod-shaped) and spirochetes (spiral-shaped) cells.Īdvertisement Which is not a Gram positive bacteria? Staphylococcus aureus).Ī coccus (plural cocci) is any bacterium or archaeon that has a spherical, ovoid, or generally round shape.
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