I stole the images offline
It's a-me, Mario.
Katja*, 27, has unicorned on two separate occasions.
To pull this off, the authority required three things: the ability to identify cases in a timely fashion, and so determine the infection's direction of travel; an understanding of how the disease spread (by water? air? insect vector?), and hence the measures that were likely to block it; and some means of ensuring compliance with those measures. When all three of these ingredients – which we'll describe in more detail in the following sections – were in place, containment could be extremely effective, but a hat-trick was rare.
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