(apologies for the possibly bad format as I am transitioning some parts of my private blog to Jewcy for the first time!)

(unfortunately, was no successful in uploading illustration, you may find it there: http://www.nypl.org/research/chss/jws/aboutyizkor.html )

Ok, well, in fact, Pesach luck, and a bit late. Beautiful hypothesis as to why the Jews may have survived the mediaeval plagues better than others, quoted in the fabulous Survival of the Sickest:

As part of (the) observance (of Pesach,) Jews do not eat leavened bread and remove all traces of it from their homes. In many parts of the world, especially Europe, wheat, grain, and even legumes are also forbidden during Passover. Dr Martin J. Blaser, a professor of internal medicine at NYU Medical Center, thinks this "spring cleaning" of grain stores may have helped to protect Jews from the plague, by decreasing their exposure to rats hunting for food —rats that carried the plague. (Moalem, p. 10)

(Unfortunately, and as is quite usual, we were not protected from all evils: the Jews were scapegoats for the Black Death, and many were killed in "retaliation" -the picture is of the Nuremberg synagogue, destroyed in 1349 along with a massacre and expulsion of the Jews with the plague as a pretext. Of course, a synagogue was eventually rebuilt, and then burnt down again three months before Kristallnacht.)