Cases of severe pneumonia in April 2009 compared to the previous three years, and February of this year. The disproportionate numbers in the age range 15-49 is the signature of a pandemic virus (Image: Mexican Health Ministry)From New Scientist:
New data from Mexico and case numbers so far suggest that if the spread of H1N1 "swine flu" continues elsewhere as it has in the Americas, the virus could infect more than a billion people by July.
The data also suggests that the virus may not be slowed by summer temperatures in temperate countries. However, it spreads slowly enough to respond to the "social distancing" measures used in Mexico.
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