Enhancement of the antigenic activity and virulence of the vaccine strain E of Rickettsia prow azeki by passages in cell culture
Related Experiment Videos
07:18An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines
Published on: October 11, 2022
2.6K
08:52Evaluation of Host-Pathogen Responses and Vaccine Efficacy in Mice
Published on: February 22, 2019
11.4K
09:13Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy
Published on: November 1, 2011
18.1K
View abstract on PubMed
Summary
Cultivating Rickettsia prowazeki (vaccine strain E) in human amnion cells enhanced its antigenic activity and virulence. These biological property changes were observed in over 45% of cell cultures after prolonged passages.
Area of Science:
- Microbiology
- Cell Biology
- Vaccinology
Background:
- Rickettsia prowazeki is the causative agent of epidemic typhus.
- Vaccine strain E of Rickettsia prowazeki has been used for prophylaxis.
- Understanding changes in microbial properties during host cell cultivation is crucial for vaccine development.
Purpose of the Study:
- To investigate alterations in the biological properties of Rickettsia prowazeki vaccine strain E.
- To assess the impact of human amnion (A1) cell cultivation on rickettsial antigenic activity and virulence.
Main Methods:
- Infection of A1 cells with Rickettsia prowazeki vaccine strain E.
- Serial passage of infected A1 cell cultures.
- Monitoring changes in antigenic activity and virulence of Rickettsia prowazeki populations.
Main Results:
- Cultivation in A1 cells led to increased antigenic activity and virulence in Rickettsia prowazeki.
- Observed changes in 10 out of 22 cell cultures (45.5%).
- Increased antigenic activity occurred in 6 cultures; increased antigenic activity and virulence in 4 cultures, with changes appearing between 12-18 and 53-102 days.
Conclusions:
- Human amnion cell cultivation can modify the biological properties of Rickettsia prowazeki vaccine strain E.
- These modifications involve enhanced antigenic activity and virulence.
- The findings have implications for the stability and efficacy of Rickettsia vaccines.