Related Experiment Video
Updated: Aug 10, 2026

Experimental Human Pneumococcal Carriage
Published on: February 15, 2013
Gram-negative Diplococcal Respiratory Infections
Nargis Naheed1, Maqsood Alam, Larry I. Lutwick
1*Infectious Diseases, VA New York Harbor Health Care System, 800 Poly Place (IIIE), Brooklyn, NY 11209, USA. larry.lutwick@med.va.gov
Abstract:
Human respiratory tract infections caused by gram- negative diplococci continue to remain significant issues in health care. Although not addressed as frequently as the classical diplococcal pneumonia, the gram-positive Streptococcus pneumoniae (the pneumococcus), infections due to Neisseria meningitidis (the meningococcus), and Moraxella catarrhalis (formerly called both Neisseria catarrhalis and Branhamella catarrhalis) are addressed here including their microbiology, respiratory tract manifestations, antimicrobial treatment, and potential prevention with immunization.
Insights
Gram-negative diplococci cause significant respiratory infections. This review covers Neisseria meningitidis and Moraxella catarrhalis, detailing their microbiology, symptoms, treatments, and prevention strategies.
Area of Science:
- Microbiology
- Infectious Diseases
- Respiratory Medicine
Background:
- Gram-negative diplococci, including Neisseria meningitidis and Moraxella catarrhalis, are significant causes of human respiratory tract infections.
- These infections are often overlooked compared to Streptococcus pneumoniae, despite their clinical relevance.
Purpose of the Study:
- To provide a comprehensive overview of infections caused by Neisseria meningitidis and Moraxella catarrhalis.
- To discuss the microbiology, clinical manifestations, treatment, and prevention of these specific diplococcal infections.
Main Methods:
- Literature review and synthesis of existing research on Neisseria meningitidis and Moraxella catarrhalis.
- Analysis of microbiological characteristics, clinical presentations, and therapeutic options.
Main Results:
- Detailed description of the microbiology of Neisseria meningitidis and Moraxella catarrhalis.
- Outline of respiratory tract manifestations associated with these pathogens.
- Summary of current antimicrobial treatment strategies and immunization-based prevention.
Conclusions:
- Neisseria meningitidis and Moraxella catarrhalis represent important, though less frequently discussed, causes of respiratory infections.
- Understanding their characteristics is crucial for effective management and prevention, including the potential role of immunization.
More Related Videos
09:20Investigating the Effects of Probiotics on Pneumococcal Colonization Using an In Vitro Adherence Assay
Published on: April 28, 2014
11:32Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
Published on: February 23, 2014
Related Concept Videos
Pneumonia I: Introduction
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 III: Complications and Assessment
Microbiota of the Respiratory Tract
Diphtheria
Atypical Pneumonia
Pneumonia I: Introduction