Characteristics of streptococcus agalactiae
What is the morphology of Streptococcus agalactiae?
Morphology of Streptococcus agalactiae
agalactiae are spherical or ovoid Gram-positive cocci of the size 0.6–1.2 µm in diameter. However, some species may develop rod-like cells depending on the growth conditions.
How do you identify Streptococcus agalactiae?
GBS is characterized by the presence in the cell wall of the antigen group B of Lancefield classification (Lancefield grouping) that can be detected directly in intact bacteria using latex agglutination tests. The CAMP test is also another important test for identification of GBS.
What is Streptococcus agalactiae known for?
agalactiae is a species of bacterium that causes illness in people of all ages. Also known as GBS, this bacterium is a common cause of severe infections in newborns during the first week of life. More recently, experts recognized the increasing impact invasive GBS disease has on adults.
What is the classification of Streptococcus agalactiae?
Pathogen name and classification
Streptococcus agalactiae or group B streptococcus (GBS)—a gram-positive, β-hemolytic organism in the Streptococcus genus that carries the Lancefield group B antigen. GBS are encapsulated organisms and ten antigenically distinct capsular serotypes have been described (1a, 1b, II–IX).
Is Streptococcus agalactiae gram-positive or negative?
Group B Streptococci (GBS), or Streptococcus agalactiae, is the most common cause of life-threatening bacterial infection in human newborns. These bacteria are Gram-positive, β-hemolytic, chain-forming cocci that are normal residents of the vaginal flora in 25% of healthy women [3].
Is Streptococcus agalactiae catalase positive or negative?
Negative
Biochemical Test and Identification of Streptococcus agalactiae
| Basic Characteristics | Properties (Streptococcus agalactiae) |
|---|---|
| Catalase | Negative (-ve) |
| Coagulase | Negative (-ve) |
| Flagella | Non-flagellated |
| Gram Staining | Positive (+ve) |
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9 ago 2022
Where is Streptococcus agalactiae found?
Definition. Group B Streptococcus (GBS), also known as Streptococcus agalactiae, is a bacterium commonly found in the gut and genitourinary tract of healthy adults. However, it is also an important cause of serious, life-threatening infections in newborns.
What is Streptococcus agalactiae in urine?
Streptococcus agalactiae can cause urinary tract infection (UTI) including cystitis and asymptomatic bacteriuria (ABU). The early host-pathogen interactions that occur during S. agalactiae UTI and subsequent mechanisms of disease pathogenesis are poorly defined.
Does Streptococcus agalactiae grow on MacConkey Agar?
Hence, it does not grow on MacConkey agar (MA) due to the absence of blood as well as due to the presence of high concentration of bile in the medium which is inhibitory to the growth of S.
What does Streptococcus agalactiae cause in humans?
Streptococcus agalactiae is a gram-positive coccus that is commonly known to cause invasive infections in pregnant women and newborns. Infections range from local skin and soft tissue infections to invasive infections with meningitis, infective endocarditis, and sepsis [1,2].
How do you treat streptococcus agalactiae UTI?
Doctors usually treat GBS disease with a type of antibiotic called beta-lactams, which includes penicillin and ampicillin. Sometimes people with soft tissue and bone infections may need additional treatment, such as surgery.
Is it normal to have strep B in urine?
Many adults carry group B strep in their bodies — usually in the bowel, vagina, rectum, bladder or throat — and have no signs or symptoms. In some cases, however, group B strep can cause a urinary tract infection or other more-serious infections.
What bacteria causes UTI?
The most common bacteria found to cause UTIs is Escherichia coli (E. coli). Other bacteria can cause UTI, but E. coli is the culprit about 90 percent of the time.
What antibiotic treats Streptococcus agalactiae in urine?
Penicillin G is the first-line treatment for invasive GBS disease in adults (8). The duration of therapy depends on the clinical presentation. Ten days of therapy is generally acceptable for bacteremia, pneumonia, pyelonephritis, and skin/soft tissue infections.
What does Strep B discharge look like?
Even though health care providers do not widely recognize GBS vaginitis, GBS can cause yellow or green discharge as well as vaginal burning and/or irritation. These symptoms may be mistaken for a yeast infection or bacterial vaginosis.