The arrival and rapid spread of the latest strain of H1N1 flu virus, termed S-OIV, raised fears of a dangerous global pandemic. But, as the virus has continued to spread around the globe, initial fears regarding its potential lethality have gradually subsided; it can be deadly, but apparently no more so than the regular, seasonal flu.
Some researchers have now used a public database of flu immunity data to try to understand why, and their results suggest that, on some level, the seasonal flu has prepared our immune systems for the new arrival.
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