Effect of dapsone alone and in combination with intracellular antibiotics against the biofilm form of B. burgdorferi.
Level 5 - mechanism / opinion, no new human data
In vitro bench study evaluating antimicrobial combinations without human subjects
PubMed 32993780 · doi:10.1186/s13104-020-05298-6
What was done
An in vitro laboratory study evaluated the activity of dapsone alone and in combination with cefuroxime and/or intracellular antibiotics (doxycycline, rifampin, and azithromycin) against biofilm forms of Borrelia burgdorferi. The authors assessed biofilm mass using crystal violet staining, protective layer integrity via dimethyl methylene blue glycosaminoglycan assays, and bacterial viability using Live/Dead fluorescent microscopy.
What was found
The abstract reports that dapsone alone or in various combinations with doxycycline, rifampin, and azithromycin produced a significant reduction in B. burgdorferi biofilm mass, protective glycosaminoglycan layer, and overall viability. The abstract reports no numerical values, concentrations, or statistical metrics.
Why it matters
Biofilms are hypothesized to contribute to antibiotic tolerance in Lyme disease. This study demonstrates in vitro activity of dapsone combinations against Borrelia biofilm structures.
Limits
This is strictly an in vitro bench study without human subjects, so it cannot establish clinical efficacy or safety. The abstract reports no numerical data, effect sizes, or p-values. In vivo pharmacokinetics and host factors were not evaluated.
Cited by
- supports A culture study conducted with Eva Sapi demonstrated that combining dapsone with doxycycline, rifampin, and azithromycin progressively reduced Borrelia biofilm persister cells.