Immunity lasts longer than 3 years: >According to our study, it appears they can last the entire lifespan of the human organism — 90 years plus. >n our study

Immunity lasts longer than 3 years: >According to our study, it appears they can last the entire lifespan of the human organism — 90 years plus. >n our study we were looking for antibodies to the 1918 flu. This flu virus was reconstructed a number of years ago in the lab, so we were able to test to see if 90 years later we could still find antibodies. I recruited survivors, people who were born in 1915 or earlier and thus presumably survived the 1918 flu. We found that virtually all the people born in 1915 or earlier — about 90% of them — had good "titers" to the 1918 flu, which means they still had reasonably high concentrations of the antibodies in their blood, whereas among controls, people who were born in 1926 or later, it was only about 10%. That was really quite a remarkable finding. http://content.time.com/time/health/article/0,8599,1835907,00.html http://content.time.com/time/health/article/0,8599,1835907,0...