Gram-positive bacilli belong to a class of rod-shaped bacteria that acquire a violet color when subjected to the Gram staining method. Aside from its characteristic shape, this class of bacteria has a thick peptidoglycan... More »

Gram positive cocci, also known as streptococci, are known to cause numerous disorders, such as pharyngitis, skin infections, endocarditis and sepsis, and the symptoms will vary greatly depending on which vital organs ar... More »

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Gram positive cocci are a group of microorganisms responsible for a variety of infections, including staphylococcal, or staph infections; streptococcal infections, such as strep throat; and pneumococcal infections, such ... More »

Gram-negative bacteria do not retain the crystal violet stain used in the Gram staining method of bacteria identification and absorb the red counterstain, according to MedicineNet. Gram-negative bacteria have cell walls ... More »

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The primary stain is used in Gram staining to detect Gram-positive bacteria. The primary stain is a crystal violet color. When a bacteria is Gram-negative, it loses the primary stain and takes on the secondary stain of s... More »

Different species of bacteria are classified into five categories according to their shapes: cocci, bacilli, vibrios, spirochaetes or spirilla. Cocci are spherical, while bacilli are rod-shaped. Vibrios are shaped like c... More »

Gram-negative bacilli are rod-shaped bacteria that have a thin layer of peptidoglycan between two membranes. They are medically significant as many strains can cause infection in humans, including the family Enterobacter... More »