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.
LÃ³pez 2003). The annual number of lightning. deaths has been compiled in the US since 1900, and in several other developed countries for. extensive but varying periods. However, there has. been little systematic collection of information on. lightning deaths in many regions of the world. Holle. and LÃ³pez (2003) made an assessment of the. worldwide impact of lightning, and concluded that. 24,000 deaths and 240,000 injuries occur per year.