Final answer:
An infectious disease that has spread across the globe is called a pandemic, while an infectious disease that has spread across a city, region, or country is called an epidemic.
Step-by-step explanation:
An infectious disease that has spread across the globe is commonly referred to as a pandemic. Pandemics are characterized by widespread transmission of a disease across different countries and continents. A recent example of a global pandemic is the COVID-19 pandemic.
An infectious disease that has spread across a city, region, or country is commonly referred to as an epidemic. Epidemics are more localized than pandemics and can affect a smaller geographic area. An example of an epidemic is the Zika virus outbreak in South America.
Learn more about Pandemic and Epidemic