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Early Outbreak of 2009 Influenza A (H1N1) in Mexico Prior to Identification of pH1N1 Virus
- Ying-Hen Hsieh,
- Stefan Ma,
- Jorge X. Velasco Hernandez,
- Vernon J. Lee,
- Wei Yen Lim

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- Published: August 31, 2011
- https://doi.org/10.1371/journal.pone.0023853