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[Experimental vaccinal prophylaxis of Pseudomonas aeruginosa burn sepsis]
Abstract:
After the injection of P. aeruginosa live culture under the burned skin of mice sepsis develops within the first 24 hours, finally leading to the death of the animals. The microorganisms can be isolated from the blood, liver, kidneys and mesenterial lymph nodes till day 3 and from the spleen till day 5. After the intraperitoneal injection of P. aeruginosa live culture into mice, sepsis also develops within 24 hours, and the culture can be isolated from the blood and parenchymatous organs till day 3. The LD50 of the culture is equal to 5.1 X 10(6) microbial cells when introduced intraperitoneally and to 30 microbial cells in experimental burn sepsis. Experimental burn sepsis clearly demonstrates the effectiveness of Pseudomonas acellular protein vaccine: its index of effectiveness exceeds 3,000.
Insights
This study shows that Pseudomonas aeruginosa causes sepsis in mice within 24 hours. An acellular protein vaccine proved highly effective against experimental burn sepsis caused by this bacterium.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Sepsis is a life-threatening condition often caused by bacterial infections.
- Pseudomonas aeruginosa is an opportunistic pathogen known to cause severe infections.
Purpose of the Study:
- To investigate the pathogenesis of sepsis induced by Pseudomonas aeruginosa in a murine model.
- To evaluate the efficacy of an acellular protein vaccine against experimental burn sepsis.
Main Methods:
- Induction of sepsis by subcutaneous injection of live Pseudomonas aeruginosa culture in mice.
- Intraperitoneal injection of Pseudomonas aeruginosa to establish sepsis.
- Bacterial isolation from blood and organs to determine dissemination and survival.
- Determination of lethal dose 50 (LD50) for both routes of administration.
- Assessment of vaccine efficacy in a burn sepsis model.
Main Results:
- Sepsis developed within 24 hours post-infection, leading to animal death.
- Pseudomonas aeruginosa was recoverable from blood, liver, kidneys, lymph nodes, and spleen at varying time points.
- The LD50 was significantly lower in experimental burn sepsis (30 cells) compared to intraperitoneal injection (5.1 x 10^6 cells).
- The acellular protein vaccine demonstrated a high index of effectiveness (>3,000) in the experimental burn sepsis model.
Conclusions:
- Pseudomonas aeruginosa rapidly induces sepsis and disseminates systemically in mice.
- Experimental burn sepsis is a highly virulent model with a low LD50.
- The Pseudomonas acellular protein vaccine is highly effective in preventing or treating experimental burn sepsis.