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An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines
Published on: October 11, 2022
ON THE PRESERVATION OF TYPHUS FEVER RICKETTSIAE IN CULTURES
1Laboratories of The Rockefeller Institute for Medical Research.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Typhus fever rickettsiae remain viable for months at 37°C and -20°C but not at intermediate temperatures. Infected tissues stored at 37°C remained infectious for over 10 weeks, supporting the etiological role of rickettsiae.
Area of Science:
- Microbiology
- Infectious Diseases
- Virology
Background:
- Typhus fever is a significant infectious disease.
- Rickettsiae are the causative agents of typhus fever.
- Understanding rickettsial survival is crucial for disease control.
Purpose of the Study:
- To determine optimal storage conditions for typhus fever rickettsiae.
- To assess the viability and infectivity of rickettsiae under various temperatures.
- To provide further evidence for the etiological role of rickettsiae in typhus.
Main Methods:
- Cultures of typhus fever rickettsiae were stored at different temperatures (-20°C, -4°C, 20°C, 37°C).
- Viability and virulence were assessed after storage periods.
- Infected guinea pig tissues were stored in serum-Tyrode mixture at 37°C.
Main Results:
- Rickettsiae remained viable and virulent after months at 37°C and -20°C.
- Survival failed at intermediate temperatures (20°C, -4°C).
- Infected tissues remained infectious at 37°C for over 10 weeks.
Conclusions:
- Specific low temperatures (-20°C) and optimal high temperatures (37°C) support long-term rickettsial viability.
- These findings reinforce the etiological significance of rickettsiae in typhus fever.
- Long-term storage protocols can be developed based on these temperature-dependent survival rates.
