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Related Concept Videos

Development of the Oral Microbiota01:28

Development of the Oral Microbiota

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The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
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Factors Affecting the Risk of Infection01:26

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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A Murine Model of Group B Streptococcus Vaginal Colonization
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Recurrent bacteremia with Streptococcus dysgalactiae: a case-control study.

Kristina Trell1, Parham Sendi2, Magnus Rasmussen1

  • 1The Division of Infection Medicine, Department of Clinical Sciences, Lund University, Sweden.

Diagnostic Microbiology and Infectious Disease
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

Recurrent Streptococcus dysgalactiae (SD) bacteremia is often linked to host-specific colonization, not identifiable clinical risk factors. Identical emm types between infections suggest persistent bacterial presence in the host.

Keywords:
BacteremiaBeta-hemolytic streptococciRecurrent bacteremiaStreptococcus dysgalactiaeemm-type

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Area of Science:

  • Microbiology and Infectious Diseases
  • Clinical Epidemiology
  • Bacteriology

Background:

  • Beta-hemolytic streptococci groups C and G, identified as Streptococcus dysgalactiae (SD), are known to cause severe and recurrent invasive infections.
  • Understanding the risk factors for recurrent SD bacteremia is crucial for effective clinical management and prevention strategies.

Purpose of the Study:

  • To investigate clinical and molecular factors associated with the recurrence of Streptococcus dysgalactiae bacteremia.
  • To identify predictors of recurrent invasive infections caused by these streptococcal strains.

Main Methods:

  • A case-control study design was employed, comparing 22 cases of recurrent SD bacteremia with 92 controls experiencing single episodes.
  • Demographic data, clinical presentations, Charlson comorbidity scores, and molecular typing (emm type) of bacterial isolates were analyzed.
  • Comparison of clinical features and outcomes, including 30-day fatality, between recurrent and single-episode bacteremia groups.

Main Results:

  • The median time between recurrent episodes of SD bacteremia was 6 months, with skin and soft tissue infections being the most common presentation.
  • No significant differences were observed in demographics, comorbidity scores, or clinical presentations between recurrent and single-episode cases.
  • A high proportion (86%) of recurrent cases involved the same emm type in both episodes, suggesting host-specific colonization rather than distinct new infections.

Conclusions:

  • Clinical risk factors for recurrent Streptococcus dysgalactiae bacteremia could not be identified in this study.
  • The consistent presence of the same emm type in recurrent episodes strongly indicates persistent host colonization as the primary driver.
  • Further research into host-pathogen interactions is warranted to understand and prevent recurrent invasive SD infections.