Toss a Cinderella- or Stockholm Syndrome-type victim into the mix and presto!
And presto: polio returned—first in Nigeria then across Africa and into Asia, following an established migration pattern.
1590s, "quickly," used by conjurers, etc., from Italian presto "quick, quickly" in conjuror's patter, from Latin praestus "ready," praesto (adv.) "ready, available," from prae "before" (see pre-) + stare "to stand," from PIE root *sta- "to stand" (see stet). Cf. Latin praesto esse "to be at hand, be ready," source of French prêt "ready." As a musical direction, it is a separate borrowing from Italian, first recorded 1683.