[Experimental research on cholera vaccines. Local immunity]

Area of Science:

• Immunology
• Microbiology
• Gastroenterology

Background:

• Cholera remains a significant public health concern, necessitating effective preventive strategies.
• Understanding the immune response to cholera vaccination is crucial for developing better interventions.
• Local intestinal immunity plays a key role in protection against Vibrio cholerae infection.

Purpose of the Study:

• To evaluate the efficacy of parenteral cholera vaccine, cholera toxoid, and a complex preparation in preventing Vibrio cholerae colonization and toxin-induced damage in a rabbit model.
• To assess the impact of these preparations on the local intestinal immune response, specifically the exudative reaction to live V. cholerae.

Main Methods:

• Rabbits were immunized parenterally with cholera vaccine, cholera toxoid, or a complex preparation.
• The number of Vibrio cholerae adhering to the small intestine mucosa was quantified.
• A ligated loop model was used to assess protection against cholera toxin.
• The exudative reaction to live V. cholerae challenge was measured.

Main Results:

• Parenteral cholera vaccine administration reduced Vibrio cholerae adherence to the small intestine mucosa.
• Cholera toxoid and the complex preparation provided protection against localized cholera toxin effects in the ligated intestinal loop.
• All three preparations reduced the exudative reaction to live V. cholerae, with increasing effectiveness observed in the order: cholera vaccine < cholera toxoid < complex preparation.

Conclusions:

• Parenteral immunization with cholera vaccine, toxoid, and a complex preparation can confer protection against Vibrio cholerae.
• Cholera toxoid and the complex preparation offer superior protection against local toxin effects compared to the vaccine alone.
• The complex preparation demonstrated the highest overall efficacy in mitigating the inflammatory response to live V. cholerae challenge.