From how long you have this infection?
from how long you have this back & leg pain?
Another possibility is of lumbar radiculopathy.It is nerve irritation that is caused by damage to the discs between the vertebrae or it can occur when the nerves of the lumbar spine are irritated by mechanical cause or disease.
You need Nerve testing (EMG/electromyogram),radiology testing, such as CAT or MRI scanning,I advice you to see your neurologist for the testing to know the exact underlying cause & then take the treatment.
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