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There is an over reliance on a single paper here, and while the general points being made may be correct for the most part, I would dispute that they are all absolutes. In particular arguing that immunity only lasts x years is a notoriously oversimplified statement to make with immunity often lasting a lifetime in some individuals and mere weeks in others (if immunity is gained at all). This over reliance is probably misleading when combined with such definitive statements.--Hontogaichiban (talk) 07:04, 17 October 2013 (UTC)[reply]