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Related Concept Videos

Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
Pneumonia III: Complications and Assessment01:30

Pneumonia III: Complications and Assessment

Pneumonia poses the potential for numerous complications that warrant consideration. These complications include the following:
Development of the Oral Microbiota01:28

Development of the Oral Microbiota

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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Related Experiment Video

Updated: Jun 5, 2026

A Neonatal Imaging Model of Gram-Negative Bacterial Sepsis
08:46

A Neonatal Imaging Model of Gram-Negative Bacterial Sepsis

Published on: August 12, 2020

Streptococcus pneumoniae sepsis in the newborn.

Atul Malhotra1, Rod W Hunt, Richard R Doherty

  • 1Monash Newborn, Royal Children's Hospital, Melbourne, Victoria, Australia. atul.malhotra@southernhealth.org.au

Journal of Paediatrics and Child Health
|January 5, 2011
PubMed
Summary
This summary is machine-generated.

Streptococcus pneumoniae (SP) is a rare cause of neonatal sepsis, presenting with severe early-onset disease. Vigilance is needed for penicillin-resistant strains and to understand the impact of immunization programs.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Neonatal Medicine
  • Infectious Diseases
  • Bacterial Pathogenesis

Background:

  • Neonatal sepsis is a significant concern, with Group B Streptococcus being a common pathogen.
  • Streptococcus pneumoniae (SP) is an infrequently identified cause of sepsis in newborns.

Observation:

  • A case series identified four infants with early-onset SP infection.
  • Clinical presentations included bacteremia, pneumonia, and in one case, meningitis.
  • One infant's SP strain exhibited reduced susceptibility to penicillin.

Findings:

  • SP infections in neonates manifest as severe, rapid-onset illness.
  • Maternal illness was noted in one of the affected infants.
  • The clinical picture can resemble early-onset Group B streptococcal sepsis.

Implications:

  • Despite being uncommon, SP remains a critical pathogen in neonatal sepsis, particularly with emerging antibiotic resistance.
  • The influence of current pneumococcal immunization strategies on neonatal SP incidence requires further investigation.
  • Healthcare providers should consider SP, including resistant strains, in the differential diagnosis of neonatal sepsis.