Hi Zeke
As you already know, Lyme disease is caused by a bacteria that enters our body from the bite of a tic. Doctors will put patients on an antibiotic for 2~4 weeks which will kill the bacteria but the effects of the infection may linger for 6 months. I hope your student has been treated and all the bacteria has been killed! If so, than there should be no worry that the
Borrelia spirochetes can become reactivated. But, really your student should get the all clear from her/his doctor.
Assuming there is no lingering infection, then physical therapy should be safe. This physiotherapy
website suggests “Direct physical therapy interventions include massage, range of motion, myofascial release, and modalities including ultrasound, moist heat, and paraffin. Exercise prescription is aimed at improving strength and gradually increasing the patient's conditioning level which may be severely impaired as a result of chronic Lyme infection. Whole-body workouts generally feature extensive stretching, light calisthenics, and light resistance training with low loads and high repetitions., From this description, yoga seems to be a good form of exercise.
(By the way, when we see a scary phase like “chronic Lyme infection,, usually this is referring to the 6 month recovery period that some people go through after the antibiotic treatment. The more accurate time for this is “Post-treatment Lyme Disease Syndrome,.)
Once again, while I see no documented evidence that yoga or physical evidence would be harmful, your student really should discuss her/his concern with her doctor first, and then with that feedback you can both work out a protocol for her yoga practice that should help her recover from the effects of the infection.
Cheers
Bernie