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.
Can I get struck by lightning when I'm indoors? Over 1,000 people get struck by lightning every year in the United States, and over 100 of them die as a result of the strike. Lightning is a very dÂ­angerous force that, yes, can even reach you indoors if you're in contact with the telephone or plumbing. Â­If lightning strikes the phone line outside your house, the strike will travel to every phone on the line -- and potentially to you if you are holding the phone.