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.
Answer: Muscle spasm results from inflammation that occurs when a muscle is overstretched or torn. It begins as a muscle strain, which doesn't sound like a serious injury, but it can cause severe low back pain. Many people go to the emergency room each year because of a muscle strain.In fact, most episodes of acute lower back pain are caused by damage to the muscles and/or ligaments in the low back.any people go to the emergency room each year because of a muscle strain. In fact, most episodes of acute lower back pain are caused by damage to the muscles and/or ligaments in the low back.