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Your claim about no vaccine being effective past seven years is 100% nonsense. http://www.immune.org.nz/duration-protection-efficacy-and-effectiveness http://ww

• agentsmith 12y ago
  Your claim is completely worthless. My claim makes perfect sense and is backed up by the existence of booster shots as well as CDC recommendations. I sincerely hope people who work harsh environments don't disregard tetanus boosters every seven years because of unfounded claims of longer effect. The reason some studies may claim a longer immune term is more likely due to reinfection than vaccine induced immunity. For example, polio is often present, even in first world environments. So its only normal for people to have a testable immune response that would look like immunization response. Clear double-blind studies can not be done because there is no way to differentiate at this time.