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Actual viruses spreading in
the wild.
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Summer of 1999, the start of
many more mass-mailers. Mass-mailers
immediately make it into the wild, being seen all over the place right away.
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ITW status has a 1-yr shelf
life, with a 1-3 month bookkeeping (reporting) delay. If it's not seen for a year, it goes off
ITW. Thus, the decline recently. But slope of decline is less than slope
rise in 2000, meaning more new viruses are replacing the ones that die.
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Mass-mailers die off quicker
than slow mailers. So, effectively, a
lot of mass-mailers will drop off the ITW list 15-18 months after
discovery. So, as the chart is
starting to show, the decline is ending.
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