Mexico City returns to normality, but cases of A/H1N1 reach almost 2000 in US.
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D006801:Humans; D015994:Incidence; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*; D008800:Mexico / Q000453:epidemiology; D014481:United States / Q000453:epidemiology