If you really want to destroy your liver and worsen your immune system, the worst thing you could do is take chemical antibiotics as they will harm you more.
I suggest going the natural route as I did. Read books and learn as there are many good books out there such as Healing Lyme by Stephen Buhner (can be bought at amazon.com), then the protocol I used from Dr. Jernigan's book "Beating Lyme Disease" which can be bought below:
Before taking any medicines or botanicals, try to build up your immune system first. Take immune boosting supplements (I personally like Green Vibrance), and detox like crazy on a daily basis.
In the Newbie Section on top of this forum there is a long post that I wrote about detoxing. That will also build up your immune system.
It really doesn't matter about the strains of the bacteria's (I believe there are strains that haven't been identified yet). It's all about a strong immune system so one's body can kill all these strains by itself.
Hope this helps,