Word: reassorted
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Dates: during 2000-2009
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...deaths thus far in Mexico - have been found in people who are relatively young, which is unusual for the flu, or why this strain seems to be spreading at a time of year when the flu usually levels off. "These viruses mutate, these viruses change, these viruses can further reassort with other genetic material," said Michael Ryan, the WHO's global alert and response director. "So it would be imprudent at this point to take too much reassurance." (Read "CDC Readies Swine Flu Vaccine...
Birds are the natural reservoirs of the common flu strains that strike in winter - and those strains reassort themselves to hit humans particularly hard. But while humans are not susceptible to every strain of avian flu, pigs definitely are. When bird flu viruses replicate in pigs, they pick up the viral machinery that gives more selective flu strains the power to spread to other mammals, like us. That's what makes pigs such potent mixing bowls for flu. The roundabout bird-pig-human route may be less common than the straight bird-human jump, but it may be more problematic...
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