Search results
Results from the WOW.Com Content Network
Gram positive bacteria are an increasingly important cause of bacteremia. [13] Staphylococcus, streptococcus, and enterococcus species are the most important and most common species of gram-positive bacteria that can enter the bloodstream. These bacteria are normally found on the skin or in the gastrointestinal tract. [citation needed]
After the 1980s, gram-positive bacteria, most commonly staphylococci, are thought to cause more than 50% of cases of sepsis. [ 17 ] [ 27 ] Other commonly implicated bacteria include Streptococcus pyogenes , Escherichia coli , Pseudomonas aeruginosa , and Klebsiella species. [ 28 ]
A Gram stain is performed to show Gram-positive cocci in chains. Then, the organism is cultured on blood agar. The rapid pyrrolidonyl arylamidase (PYR) test is commonly used, wherein a positive reaction confers a presumptive identification of group A beta-hemolytic streptococci if the appearance and clinical context is consistent.
Streptococcus pneumoniae is the most common bacterial cause of pneumonia in all age groups except newborn infants. Streptococcus pneumoniae is a Gram-positive bacterium that often lives in the throat of people who do not have pneumonia. Other important Gram-positive causes of pneumonia are Staphylococcus aureus and Bacillus anthracis.
Arcanobacterium haemolyticum is a species of bacteria classified as a gram-positive bacillus. It is catalase -negative, facultative anaerobic , beta-hemolytic , and not motile . [ 1 ] It has been known to cause head and neck infections, pharyngitis , and sinusitis ( Arcanobacterium haemolyticum infections ).
Streptococcus dysgalactiae is a gram positive, beta-haemolytic, coccal bacterium belonging to the family Streptococcaceae.It is capable of infecting both humans and animals, but is most frequently encountered as a commensal of the alimentary tract, genital tract, or less commonly, as a part of the skin flora.
They are characterized as Gram-positive, nonmotile, acid-fast, short to long rods. [citation needed] Colony characteristics. Usually, colonies are smooth, rarely rough, and not pigmented colonies. Older colonies may become yellow. Physiology. Growth on Löwenstein-Jensen medium and Middlebrook 7H10 agar occurs at 37°C after seven or more days.
In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall. The Gram stain is used by microbiologists to place bacteria into two main categories, Gram-positive (+) and Gram ...