Quote:
“The third said that the Jews had poisoned all the wells and were killing Christians [wollten]; and bags of poison were found in many wells, and [deshalb] countless numbers of them were killed on the Rhine, in Franconia and in all German lands. Truly, whether some Jews did that, I don’t know. […] However, I know very well that there were more Jews in Vienna than in any other city I know of in Germany, and that they died there (…) in large numbers (…)”
Source:
Bernd Schneidmüller (2012): Catastrophic memory: Great plague and Jewish pogroms 1348 to 1352. Volume 2, p. 399
Author Bio:
Konrad von Megenberg (1309-1374) was a clergyman and author. The quote comes from his book "The Book of Nature". It is expressly written for laypersons and not for experts.
Context:

Further Reading:
*Ruth Kinet (2020): With the Plague Came the Progoms (from the podcast "From the Jewish World")
*František Graus (2002): Jewish progroms in the 14th century: The Black Death
*Haverkamp, Alfred (1981): The persecution of Jews at the time of the Black Death in the social fabric of German cities