Active and Passive Immunity. Naturally acquired active immunity occurs when the person is exposed to a live pathogen, develops the disease, and becomes immune as a result of the primary immune response. Artificially acquired active immunity can be induced by a vaccine, a substance that contains the antigen.
Lower back tightness can cause muscle twitching, pain and reduced range of motion. Lower back muscle tightness is the cause of a muscle spasm. This can be brought on by a strain, overuse or muscle weakness, according to BetterMedicine.com.
Inflammatory causes of back pain: Inflammatory causes of back pain refers to back discomfort caused by an inflammatory disease, disorder, or condition. See detailed information below for a list of 7 causes of Inflammatory causes of back pain, Symptom Checker, including diseases and drug side effect causes. Causes of Inflammatory causes of back pain: