Why has urbanization increased the risk of disease epidemics in the modern era?

Answer;
Overcrowding in urban areas makes easier for diseases to spread quickly to many people.

Explanation;
Urbanization refers to movement of people to urban areas which leads to an increase in the number of people living in urban areas (towns and cities).
Urbanization leads to many challenges for global health and the epidemiology of infectious diseases. This may be attributed to overcrowding in urban areas leading to poor leading standards which favor disease epidemics.