Conversation so far:
What was the Great Plague?
The Great Plague, lasting from 1665 to 1666, was the last major epidemic of the bubonic plague to occur in England.
What happened to the poor during the Great Plague of London?
The poorer people were alarmed by the contagion and some left the city.

Question: Did they become sick?
Self-contained rewrite: Did the poor become sick during the Great Plague of London?