Describe at least ONE specific step you would take to control the spread and mitigate the impact of the outbreak/epidemi

[answerhappygod]

Describe at least ONE specific step you would take to control
the spread and mitigate the impact of the outbreak/epidemic
situations listed below, assuming no anachronistic
changes/improvements in medical technology (e.g. no
antibiotics/vaccines suddenly available in the Middle Ages), but
assuming an understanding of germ theory and relevant pathogen
epidemiology/transmission:
choose only one disease to talk bout
a. Plague (Y. pestis), Middle Ages
b. Cholera in London, circa 1854
c. Pandemic influenza, 1918
d. Yellow Fever in the Americas, circa 1800s