Burden of influenza in Latin America and the Caribbean: a systematic review and meta-analysis.

Influenza Other Respir Viruses · 2013 · PMC4634294 · PMID 23210504

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a definite trendno p-value reported

The circulation of H3 or H1 subtypes did not appear to show a definite trend when analyzed by season or by country.

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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.