The team found that exposing B. burgdorferi to stevia leaf extract wiped out Lyme disease in its different forms :(1) spirochetes,(2) round bodies , (3) spheroplast (L-form), (4) the exceptionally hard-to-kill biofilm forms. 

Lyme assumes many forms to enhance its survival. Borrelia shift into a more dormant, “round body” state when unfavorable conditions in the body strike or when a body’s immune system starts to mount an attack. Antibiotic exposure can also have the same effect

The form that is most elusive is the“biofilm” form, where the bacteria hide themselves in a complex protein/mucous mixture for protection against antibiotics.
 

Here's the good news.

The study found stevia leaf extract actually killed all forms of the Lyme germ, including its biofilm form. That said, this study occurred in a petri dish in the laboratory and the organism hides in many different tissues of the body. It loves the brain as it is so spongy. Sometimes I wonder if that is why we are seeing so many cases of Canine Dementia nowadays
 

Stevia is safe for dogs while Xylitol is not safe in any way, shape or form for dogs. Click the button below to learn about the dangers of Xylitol.

Here's the good news. Stevia leaf extract outperformed drugs like doxycycline which are commonly used to treat the disease. Oftentimes, a week after the antibiotics therapy is discontinued in humans, viable B. burgdorferi begin to surface again. This did not happen with the stevia group, which appeared to result in a complete kill after seven days. 
 

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Interestingly, the protective biofilm increased in size as the result antibiotic therapy.  Four types of stevia were used in the study. The liquid forms all showed promise but the powdered form did not. Note that this is in a laboratory study, not in a mammalian body. 

Since the initial study in 2015 multiple studies have reconfirmed the effectiveness of Stevia in killing the Lyme pathogen.