Lyme borreliosis--an update.

Area of Science:

• Infectious Diseases
• Microbiology
• Immunology

Background:

• Lyme borreliosis is the most prevalent tick-borne infectious disease in the Northern Hemisphere.
• Disease presentation varies geographically due to distinct Borrelia burgdorferi sensu lato genospecies and host specificity.
• Borrelial dissemination is facilitated by extracellular matrix degradation and immune evasion mechanisms.

Purpose of the Study:

• To review the pathogenesis, immune evasion strategies, and diagnostic complexities of Lyme borreliosis.
• To highlight advancements in serologic testing for Borrelia burgdorferi infection.

Main Methods:

• Review of current literature on Lyme borreliosis pathogenesis and diagnostics.
• Discussion of Borrelia burgdorferi mechanisms for immune evasion, including decorin adherence and altered antigen expression.
• Examination of novel serologic tests utilizing recombinant and in vivo expressed antigens.

Main Results:

• Borrelia burgdorferi employs strategies like decorin binding and antigen variation to evade the host immune response.
• Re-infection with Borrelia burgdorferi, even with the same strain after latency, can occur.
• New serologic tests show promise but diagnostic challenges persist due to cross-reactivity and variable immune responses.

Conclusions:

• Effective diagnosis of Lyme borreliosis is hindered by factors such as seropositivity in healthy individuals, persistent antibodies post-treatment, and absent immune responses in some patients.
• Advancements in diagnostics, including recombinant and in vivo antigens like VlsE and DbpA, aim to improve accuracy.
• Further research is needed to overcome diagnostic limitations and understand the complex host-pathogen interactions in Lyme borreliosis.