Why did the bubonic plague not spread worldwide?

The plague lasted in London until the late autumn when the colder weather helped kill off the fleas. Over the centuries Bubonic Plague has broken out in Europe and the Far East. ... Influenza seems to be the modern form of plague. At the end of World War One an influenza outbreak circled the world during 1918 – 1919.

The plague skipped over or barely touched some European villages, and may not have infected at all vast regions

Explanation:

peasants’ war, (1524–25) peasant uprising in germany inspired by changes brought by the reformation, peasants in western and southern germany invoked   divine law to demand agrarian rights and freedom from oppression by nobles and landlords. as the uprising spread, some peasant groups organized armies. although the revolt was supported huldrych zwingli and thomas müntzerits condemnation by martain luther contributed to its defeat, principally by the army of the swabian league. some 100,000 peasants were killed. reprisals and increased restrictions discouraged further attempts to improve the peasants’ plight.

i think it would be " a" i might be wrong tho