Related Experiment Video
Updated: Jun 19, 2026
12:23
Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG
Published on: May 16, 2017
STUDIES ON BACILLUS WELCHII WITH SPECIAL REFERENCE TO GAS GANGRENE
1Department of Pathology, of Northwestern University Medical School, Chicago, and the Research Laboratory, Ambulance de l'Océan, La Panne, Belgium.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Bacillus welchii spores are prevalent on soldier uniforms and in war wounds. Deep muscle tissue injury is key to gas gangrene development, not just bacterial presence.
Area of Science:
- Microbiology
- Bacteriology
- Wound Infection Research
Background:
- Bacillus welchii spores were identified on 100% of Belgian soldier uniforms from trenches.
- These bacteria were also found in 75% of fresh war wounds examined.
Purpose of the Study:
- To investigate the prevalence of Bacillus welchii in military environments and its relation to gas gangrene.
- To determine the growth characteristics of Bacillus welchii in varying saccharose concentrations.
- To assess the effect of oxygenation on Bacillus welchii gas production.
Main Methods:
- Bacterial spore analysis of soldier uniforms and trench cloth samples.
- Wound sample collection and microbiological examination from war casualties.
- In vitro culture experiments with Bacillus welchii in varying saccharose concentrations.
- Gaseous output measurement in Bacillus welchii cultures with and without oxygen bubbling.
Main Results:
- Bacillus welchii spores were ubiquitous on uniforms and in wound samples.
- Gas gangrene developed in only 20% of infected patients, suggesting other factors are critical.
- Bacillus welchii growth is inhibited at 60% saccharose concentration but can occur up to 50%.
- Oxygen bubbling significantly reduced gas production in Bacillus welchii cultures without reducing organism count.
Conclusions:
- Deep lacerated muscle tissue is a critical factor in gas gangrene onset following Bacillus welchii infection.
- The saccharose tolerance and oxygen sensitivity of Bacillus welchii inform potential therapeutic strategies.
More Related Videos
13:47Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens
Published on: May 19, 2020
09:25Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
Published on: August 19, 2016
Related Concept Videos
01:12Bacterial Toxins
Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
01:13Special Staining Techniques
Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
01:25Inhalation Anthrax
Anthrax is a zoonotic disease caused by Bacillus anthracis, a Gram-positive, spore-forming bacterium. It primarily affects herbivorous animals but can be transmitted to humans through skin contact, ingestion, or inhalation of spores.Cutaneous anthrax, the most common form, typically results from direct contact with bacterial spores through skin abrasions and is generally less severe. Gastrointestinal anthrax results from eating undercooked or contaminated meat. It affects the mouth, throat, or...
01:26Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture
Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
Gram Stain
The Gram Stain is an integral part of sputum studies. It involves the staining of sputum, which permits...
Gram Stain
The Gram Stain is an integral part of sputum studies. It involves the staining of sputum, which permits...
01:28Regulation of Bacterial Virulence
Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
01:22Botulism
Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...