Diphtheritic polyneuropathy in the wake of resurgence of diphtheria.

J Pediatr Neurosci · 2015 · PMC4770643 · PMID 26962337

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a significant trendno p-value reported

Studies from Russia showed a significant trend of decreasing immunity with increasing age, resulting in lack of protection, particularly for adults aged 30 to 50 years.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.