I can't say it any better than this:
"...Lyme Disease, is capable of transforming into three distinct bacterial forms: spirochete, cell-wall-deficient (or L-form), and cyst. This transformation occurs for the purpose of bacterial survival and proliferation in the human body.
Each form has different characteristics and vulnerabilities; hence, each form must be treated differently."
www.lymebook.com/top10formsFollow the above link to see a chart explaining more.