Why do up to 25 percent of people treated for Lyme disease report lingering symptoms, lasting from days to years?

When the ‘cure’ doesn’t end the pain

Some Lyme disease patients have symptoms that can linger for years despite standard treatment. Scientists are puzzling over how that can be

"Doctors put the 36-year-old South End woman on three weeks of antibiotics and Dean immediately began to feel well. But when the medication ended, so did her better health. Abruptly, Dean was catapulted into one of the most contentious debates in medicine today: Why do up to 25 percent of people treated for Lyme disease report lingering symptoms, lasting from days to years?"

http://www.bostonglobe.com/news/science/2013/08/17/huge-question-about-lyme-why-some-patients-report-lingering-symptoms/DP82z7oYLdfq8wEQZ7ekaL/story.html