Ragweed as an example of worldwide allergen expansion.

Allergy Asthma Clin Immunol · 2008 · PMC2868868 · PMID 20525135

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an increasing trendno p-value reported

In Switzerland, there has been an increasing trend in measured ragweed pollen counts in Geneva since sampling was started in 1979.

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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.