Studies on immune responses in afferent and efferent lymph of lymph nodes draining the tissues have contributed to the concept that primary immune responses are generated in the lymph nodes with a delay before antigen-specific effector cells arrive at the affected tissue.
Lightning strikes the ground approximately 25 million times each year in the U.S. According to the NWS, the chance of an individual in the U.S. being killed or injured during a given year is one in 240,000. Assuming an average life-span of 80 years, a person's odds over their lifetime becomes one in 3000.
From 1993 through 2010, Texas had 246 injuries and 57 deaths â 303 total reported lightning strikes, an average of about 18 per year. In 2009, 11 folks were injured in Texas. Add in the three who were killed and thatâs at least 13 people struck by lightning that year, not counting strikes that went unreported.