Officials watch events in southern hemisphere as swine flu rates in UK slow down.
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D001118:Argentina / Q000453:epidemiology; D001315:Australia / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*; D008800:Mexico / Q000453:epidemiology; D006113:United Kingdom / Q000453:epidemiology