If we are to believe them, then there are currently 5 people alive who were born in the 1800s. All of them were born in the final two years of the century and have 113 to 115 years, located all over the world, places like Japan, Italy, etc.
Answer:
Firstly, what plague? Are we talking about the Bubonic plague?
Explanation:
1) By rats, Which served as the vector which spread the disease.
2) Lack of hygiene and them throwing their sewage and was out of their window into the street.
its d. its sounds ridiculous enough