Vaccines against human diarrheal pathogens: current status and perspectives

Area of Science:

• Infectious Diseases
• Vaccinology
• Public Health

Background:

• Diarrheal infectious diseases (DID) cause significant global morbidity and mortality, particularly in developing nations with poor sanitation.
• Contaminated food and water facilitate the spread of pathogens like Vibrio cholerae, Shigella spp., and rotavirus, leading to widespread outbreaks.
• While vaccines exist for some diarrheal pathogens, continuous development is needed to combat evolving threats and improve efficacy.

Purpose of the Study:

• To review currently available vaccines against major diarrheal pathogens: Vibrio cholerae, Shigella spp., and rotavirus.
• To explore novel vaccine development strategies, including traditional and reverse vaccinology approaches.
• To discuss factors influencing vaccine efficacy, such as delivery route and adjuvants, for preventing DID.

Main Methods:

• Literature review of existing and emerging vaccines for diarrheal infectious diseases.
• Analysis of traditional vaccine platforms (killed, live attenuated, toxoid, conjugate) and novel approaches (reverse vaccinology: DNA/mRNA, vector, recombinant subunit, plant-based).
• Discussion of critical components for vaccine development, including adjuvants, delivery systems, and mucosal immunization strategies.

Main Results:

• Several traditional and novel vaccine types are available or in development for key diarrheal pathogens.
• Vaccine development is complex, requiring significant resources and facing challenges in preclinical and clinical stages.
• Mucosal immunization, alongside optimized adjuvants and delivery systems, shows promise for enhancing vaccine effectiveness against DID.

Conclusions:

• Existing vaccines and ongoing development efforts are vital for controlling major diarrheal pathogens.
• Advancements in vaccinology, particularly mucosal delivery and novel platforms, are essential for improving DID prevention.
• Continued research and investment are necessary to overcome challenges and deliver effective vaccines against globally significant diarrheal diseases.