Group B streptococcal infection causes: Difference between revisions
Rim Halaby (talk | contribs) |
Rim Halaby (talk | contribs) No edit summary |
||
| Line 4: | Line 4: | ||
==Overview== | ==Overview== | ||
'''''Streptococcus agalactiae''''' also known as '''Group B Streptococcus''' is a [[gram-positive]] [[streptococcus]] characterized by the presence of group B [[Rebecca Lancefield|Lancefield]] antigen. The species name "agalactiae" meaning "no milk", alludes to this. These bacteria cause [[Group B streptococcal infection]]. Streptococcus agalactiae is a species of the normal flora of the gut and female urogenital tract. Early perinatal infection causes pneumonia or septicemia, which are associated with a high mortality. During delivery, a baby can acquire ''S. agalactiae'' and develop neonatal [[sepsis]], neonatal [[meningitis]], and/or neonatal [[pneumonia]]. Neonates with meningitis do not present with the hallmark sign of adult meningitis, a stiff neck. They display nonspecific symptoms such as fever, vomiting, poor feeding, and irritability. The polysaccharide antiphagocytic capsule is this bacterium's main [[Virulence|virulence factor]]. | '''''Streptococcus agalactiae''''' also known as '''Group B Streptococcus''' is a beta hemolytic [[gram-positive]] [[streptococcus]] characterized by the presence of group B [[Rebecca Lancefield|Lancefield]] antigen. The species name "agalactiae" meaning "no milk", alludes to this. These bacteria cause [[Group B streptococcal infection]]. Streptococcus agalactiae is a species of the normal flora of the gut and female urogenital tract. Early perinatal infection causes pneumonia or septicemia, which are associated with a high mortality. During delivery, a baby can acquire ''S. agalactiae'' and develop neonatal [[sepsis]], neonatal [[meningitis]], and/or neonatal [[pneumonia]]. Neonates with meningitis do not present with the hallmark sign of adult meningitis, a stiff neck. They display nonspecific symptoms such as fever, vomiting, poor feeding, and irritability. The polysaccharide antiphagocytic capsule is this bacterium's main [[Virulence|virulence factor]]. | ||
''S. agalactiae'' displays | ''S. agalactiae'' displays beta-hemolysis when cultured on a blood agar plate and produce zones of hemolysis that are only slightly larger than the colonies themselves. Group B streptococci hydrolyze sodium hippurate and give a positive response in the CAMP test. ''S. agalactiae'' is also sensitive to [[bile]] and will lyse in its presence. | ||
S. galactias | S. galactias | ||
==Identification== | |||
The CAMP test is an important test for identification. GBS (group B Streptococcus species) are screened through this test. It is characterized by the presence of group B Lancefield antigen and by its ability to hydrolyze sodium hippurate. | |||
It is also sensitive to bile, and will lyse in its presence. | |||
S. agalactiae's polysaccharide antiphagocytic capsule is its main virulence factor. | |||
==References== | ==References== | ||
Revision as of 12:57, 21 August 2014
|
Group B Streptococcal Infection Microchapters |
|
Differentiating Group B Streptococcal Infection from other Diseases |
|---|
|
Diagnosis |
|
Treatment |
|
Case Studies |
|
Group B streptococcal infection causes On the Web |
|
American Roentgen Ray Society Images of Group B streptococcal infection causes |
|
Directions to Hospitals Treating Group B streptococcal infection |
|
Risk calculators and risk factors for Group B streptococcal infection causes |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Streptococcus agalactiae also known as Group B Streptococcus is a beta hemolytic gram-positive streptococcus characterized by the presence of group B Lancefield antigen. The species name "agalactiae" meaning "no milk", alludes to this. These bacteria cause Group B streptococcal infection. Streptococcus agalactiae is a species of the normal flora of the gut and female urogenital tract. Early perinatal infection causes pneumonia or septicemia, which are associated with a high mortality. During delivery, a baby can acquire S. agalactiae and develop neonatal sepsis, neonatal meningitis, and/or neonatal pneumonia. Neonates with meningitis do not present with the hallmark sign of adult meningitis, a stiff neck. They display nonspecific symptoms such as fever, vomiting, poor feeding, and irritability. The polysaccharide antiphagocytic capsule is this bacterium's main virulence factor.
S. agalactiae displays beta-hemolysis when cultured on a blood agar plate and produce zones of hemolysis that are only slightly larger than the colonies themselves. Group B streptococci hydrolyze sodium hippurate and give a positive response in the CAMP test. S. agalactiae is also sensitive to bile and will lyse in its presence.
S. galactias
Identification
The CAMP test is an important test for identification. GBS (group B Streptococcus species) are screened through this test. It is characterized by the presence of group B Lancefield antigen and by its ability to hydrolyze sodium hippurate.
It is also sensitive to bile, and will lyse in its presence.
S. agalactiae's polysaccharide antiphagocytic capsule is its main virulence factor.
References
- Brooks, Geo F., Janet Butel, and Stephen Morse. Jawetz, Melnick, and Adelberg's Medical Microbiology, 22nd edition. 2001.
- Gillespie, Stephen and Kathleen Bamford. Medical Microbiology at a Glance. 2000.
de:Streptococcus agalactiae it:Streptococcus agalactiae lt:Streptococcus agalactiae sr:Б стрептококе