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Updated: Nov 24, 2025

Cultivation Methods of Spirochetes from Borrelia burgdorferi Sensu Lato Complex and Relapsing Fever Borrelia
Published on: November 25, 2022
Pathogenesis of Relapsing Fever
Job Lopez1, Joppe W Hovius2, Sven Bergström3
1Department of Pediatrics, Section of Tropical Medicine, Baylor College of Medicine and Texas Children's Hospital, Houston TX, USA.
Abstract:
Relapsing fever (RF) is caused by several species of Borrelia; all, except two species, are transmitted to humans by soft (argasid) ticks. The species B. recurrentis is transmitted from one human to another by the body louse, while B. miyamotoi is vectored by hard-bodied ixodid tick species. RF Borrelia have several pathogenic features that facilitate invasion and dissemination in the infected host. In this article we discuss the dynamics of vector acquisition and subsequent transmission of RF Borrelia to their vertebrate hosts. We also review taxonomic challenges for RF Borrelia as new species have been isolated throughout the globe. Moreover, aspects of pathogenesis including symptomology, neurotropism, erythrocyte and platelet adhesion are discussed. We expound on RF Borrelia evasion strategies for innate and adaptive immunity, focusing on the most fundamental pathogenetic attributes, multiphasic antigenic variation. Lastly, we review new and emerging species of RF Borrelia and discuss future directions for this global disease.
Insights
Relapsing fever (RF) is caused by Borrelia bacteria, transmitted by ticks or lice. This review covers RF Borrelia transmission, taxonomy, pathogenesis, and immune evasion strategies.
Area of Science:
- Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Relapsing fever (RF) is a group of diseases caused by Borrelia species.
- Transmission occurs via soft ticks, body lice (Borrelia recurrentis), or hard ticks (Borrelia miyamotoi).
- RF Borrelia possess pathogenic features enabling host invasion and dissemination.
Purpose of the Study:
- To discuss the dynamics of vector acquisition and transmission of RF Borrelia.
- To review taxonomic challenges and emerging species of RF Borrelia.
- To explore pathogenesis, including symptomology, neurotropism, adhesion, and immune evasion.
Main Methods:
- Review of existing literature on RF Borrelia.
- Analysis of transmission dynamics and vector-host interactions.
- Discussion of pathogenic mechanisms and immune evasion strategies.
Main Results:
- RF Borrelia exhibit diverse transmission routes and vectors.
- Taxonomic classification faces challenges due to newly isolated species globally.
- Pathogenesis involves multiphasic antigenic variation for immune evasion.
Conclusions:
- Understanding RF Borrelia transmission and pathogenesis is crucial for disease control.
- Ongoing research into new species and evasion strategies is vital.
- Future directions focus on managing this global infectious disease.
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