And those pesky promiscuous viruses. More insight into the 1918 pandemic - the kind everyone fears may happen again - shows it circulated for a little while before it got bad. And as Tan Ee Lyn reports from Hong Kong, it was a swine flu as well:
http://www.reuters.com/article/scienceNews/idUSTRE56C64720090713

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Are you sure it’s not the humans who are to blame? “…the Spanish flu of 1918-1919 circulated in swine and humans well before the pandemic started…”
- Posted by Peter H