…But even if this virus were to peter out soon, there is a strong possibility it would only go underground, quietly continuing to infect some people while becoming better adapted to humans, and then explode around the world…

…What’s important to keep in mind in assessing the threat of the current outbreak is that all four of the well-known pandemics seem to have come in waves. The 1918 virus surfaced by March and set in motion a spring and summer wave that hit some communities and skipped others. This first wave was extremely mild, more so even than ordinary influenza…

http://www.nytimes.com/2009/04/28/opinion/28barry.html?_r=1&ref=opinion

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