How to prevent someone from getting the black death

Never feed squirrels, chipmunks or other rodents and never touch sick or dead rodents. Don't walk or camp near rodent burrows. Wear long pants tucked into socks or boot tops to prevent flea bites. Use insect repellent (containing the chemical DEET) on skin and clothing, especially socks and pant cuffs.

my cultural heritage consists of irish, german, native american, and others.

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.