That is so very not true. Wow.
Bubonic plague: the first pandemic | Science Museum
"Many of the public health measures that we would recognize today first emerged during the Black Death."
"Medical inspections. A plague doctor would come to inspect suspected cases of plague and isolate the infected and their families in their homes."
"The medical authorities of the day had little to offer. 'Leave quickly, go far and come back slowly' was the general advice about what to do if an epidemic came to your town."
"
Many people left the city, causing a significant drop in the population. Many in the infected area were mill workers and the epidemic
effectively brought the textile industry to a halt."
"colonial authorities instituted an aggressive programme of anti-plague measures, including
house searches for victims,
enforced evacuation of residents in infected areas,
detention camps for travellers and the
exclusion of traditional medicine practitioners from infected areas."
Lessons from the History of Quarantine, from Plague to Influenza A
"some city-states
prevented strangers from entering their cities, particularly, merchants"
"Implementation of these measures required rapid, firm action by authorities, including
prompt mobilization of repressive police forces."
"A rigid separation between healthy and infected persons was initially accomplished through the use of
makeshift camps"
"A sanitary cordon—not to be broken on
pain of death—was imposed by
armed guards along transit routes and at access points to cities."