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[Experimental study of bacteremia and its role in the pathogenesis of dysentery]
Abstract:
In experiments on white mice pathophysiological, bacteriological, histological and immunofluorescent methods of investigation were used; it was shown that Sonne dysentery bacteria were capable during a short period of time to penetrate into the blood from the lumen of the stomach and the small intestine and moreover to deposit in the cells of the mucosa of the said organs. Into the large intestine the pathogen penetrates from the above situated departments of the intestine, which was most often observed in impairment of the evacuatory function of the stomach; moreover, the possibility of elimination of Sonne Shigella, as well as products of their desintegration, by the large intestine wall was shown. Bacteriemia is a short-term phenomenon and could be identified at early periods following infection, which may account for the fact of rare identification of Shigella in the blood of patients with dysentery.
Insights
Sonne dysentery bacteria can quickly enter the bloodstream from the stomach and small intestine, lodging in mucosal cells. This transient bacteremia explains why Shigella are rarely detected in patients with dysentery.
Area of Science:
- Microbiology
- Pathophysiology
- Immunology
Background:
- Shigella, the causative agent of bacillary dysentery, presents a significant public health challenge.
- Understanding the early pathogenesis and dissemination of Shigella is crucial for effective treatment and prevention strategies.
Purpose of the Study:
- To investigate the initial invasion routes and systemic dissemination of Sonne dysentery bacteria (Shigella sonnei) in a murine model.
- To elucidate the mechanisms of pathogen translocation from the gastrointestinal tract into the bloodstream and host tissues.
Main Methods:
- Pathophysiological, bacteriological, histological, and immunofluorescent techniques were employed.
- Experiments were conducted on a white mouse model to simulate Shigella infection.
Main Results:
- Sonne dysentery bacteria were observed to rapidly penetrate the blood from the stomach and small intestine lumen.
- The pathogen deposited within the mucosal cells of these organs and translocated to the large intestine, particularly with impaired gastric emptying.
- The study demonstrated the capacity of the large intestine wall to eliminate Shigella and their degradation products.
Conclusions:
- Bacteremia caused by Shigella sonnei is a transient phenomenon, primarily detectable in the early stages of infection.
- The transient nature of bacteremia likely contributes to the infrequent detection of Shigella in the blood of dysentery patients.