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Updated: Jul 18, 2026
06:11
A High-throughput Shigella-specific Bactericidal Assay
Published on: February 27, 2019
Vaccine potential for inactivated shigellae
Manuel Osorio1, Mechelle D Bray, Richard I Walker
1Division of Bacterial, Parasitic and Allergenic Products, Center for Biologics Evaluation and Research, Food and Drug Administration, 1401 Rockville Pike, Rockville, MD 20852-1448, United States.
Vaccine
|December 21, 2006
Summary
Formalin-inactivated Shigella bacteria effectively stimulate immune cells and protect mice against infection. This research highlights the potential of inactivated Shigella vaccines for preventing shigellosis.
Area of Science:
- Immunology
- Microbiology
- Vaccine Development
Background:
- Shigella species are significant human pathogens causing bacillary dysentery.
- Developing effective vaccines against Shigella remains a critical public health challenge.
Purpose of the Study:
- To evaluate the immunogenic and protective capabilities of formalin-inactivated Shigella species.
- To assess the interaction of inactivated Shigella with antigen-presenting cells and subsequent immune responses.
Main Methods:
- Human monocyte-derived dendritic cells (DCs) and Balb/c mice were used as models.
- DCs were incubated with inactivated or live Shigella bacteria.
- Mice were immunized orally or intranasally with inactivated Shigella strains.
- Humoral immune responses (IgG, IgA) and survival rates after challenge with live Shigella were measured.
Main Results:
- Inactivated Shigella induced DC maturation and cytokine release in vitro.
- Oral or intranasal immunization elicited significant IgG and fecal IgA responses to Shigella LPS.
- Vaccinated mice showed 80-100% survival following respiratory challenge with live Shigella.
- A recombinant strain expressing E. coli antigens also induced heterologous immune responses.
Conclusions:
- Inactivated Shigella species are immunogenic and induce protective immunity in a mouse model.
- These findings support the potential of inactivated Shigella vaccines for preventing Shigella infections.
- Inactivated Shigella effectively engage antigen-presenting cells, leading to protective immune responses.
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