BioFilms 
To get a really good idea how Bacteria survive in the body, you should go to YouTube to the Channel “BioFilms” where there are many videos explain how a BioFilm Colony acts as resilient organism and resists many antibiotics. This is required viewing to understand the bacteria and co-infections.
Anyway here are a few videos to get you started on BioFilms. The first is a 3-Part Video by Harvard pathologist AB MacDonald. Part 1. Part 2. Part 3.
Next is Eva Sapi’s Work that involves experimenting with antibiotic efficacy.
And a really insightful 3 videos from the Father of BioFilms Dr. Bill Costerton. There are many more videos but these are excellent to begin with.
Video 1: Treating BioFilm Infections.
Video 2. Diagnosing and Treating BioFilm Infections
Video 3. Bill Costerton and Randy Walcott Interviews At Pittsburgh.
And those are all fascinating deep-dives into the concept of BioFilms.
And Now for some supplements that can break down Biofilms such as Grapefruit Seed Extract, NAC or N-Acetyl Cysteine and even Stevia which may have an antimicrobial effect on Borrelia and Co-infections.