So - if Biden was contagious on Friday, but only tested positive on Wednesday, he's infected a whole bunch of people in the meantime. Including all of those close advisers who've been telling him not to drop out.

In 1503, Pope Alexander VI and Cesare Borgia both came down with malaria at the same time. The pope died, but because his son was bedridden, he was unable to control the conclave that followed. A placeholder pope, also deathly ill, was elected, but a few weeks later Pope Julius II, bitter enemy of the Borgia family, took power. The Borgias were finished.