Related Experiment Video

Updated: Sep 27, 2026

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
09:12

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Published on: January 17, 2014

Respiratory-tract colonization and a distinctive pneumonia syndrome in infants infected with Chlamydia trachomatis

M O Beem, E M Saxon

    The New England Journal of Medicine
    |February 10, 1977
    PubMed

    Insights

    Chlamydia trachomatis infection is linked to a unique pneumonia in infants, characterized by chronic symptoms and elevated immunoglobulin levels. This study identifies C. trachomatis as a key factor in this infant pneumonia.

    Area of Science:

    • Pediatrics
    • Infectious Diseases
    • Microbiology

    Background:

    • Infant pneumonia presents diagnostic challenges, with various pathogens implicated.
    • Chlamydia trachomatis (C. trachomatis) is a common cause of neonatal infections, including conjunctivitis and pneumonia.

    Purpose of the Study:

    • To investigate the association between Chlamydia trachomatis and a distinctive pneumonia syndrome in young infants.
    • To characterize the clinical and immunological features of this C. trachomatis-associated pneumonia.

    Main Methods:

    • Examined 47 infants (4-24 weeks) for nasopharyngeal C. trachomatis shedding and serum antibodies.
    • Assessed for C. trachomatis in infants with pneumonia, other illnesses, and inclusion conjunctivitis.
    • Measured chlamydial antibody titers using immunofluorescence assay.

    Main Results:

    • C. trachomatis was detected in 90% of infants with the specific pneumonia syndrome.
    • Infants with pneumonia showed significantly higher chlamydial antibody titers compared to those with conjunctivitis.
    • No other common respiratory pathogens were consistently linked to this pneumonia syndrome.

    Conclusions:

    • Findings strongly suggest Chlamydia trachomatis is associated with a distinct pneumonia in infants.
    • This pneumonia is likely a manifestation of widespread respiratory tract colonization by C. trachomatis in infants.
    • Highlights the importance of considering C. trachomatis in the differential diagnosis of infant pneumonia.

    More Related Videos

    Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria11:32

    Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

    Published on: February 23, 2014

    Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus06:15

    Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus

    Published on: March 6, 2019

    Related Concept Videos

    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...
    Pneumonia II: Pathophysiology01:29

    Pneumonia II: Pathophysiology

    The pathophysiology of pneumonia involves the following steps:
    Bacterial Phylum Chlamydiae01:29

    Bacterial Phylum Chlamydiae

    The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic of...
    Microbiota of the Respiratory Tract01:29

    Microbiota of the Respiratory Tract

    The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
    Atypical Pneumonia01:14

    Atypical Pneumonia

    Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...
    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...