Final answer:
Infectious diseases have caused significant pandemics throughout history, with examples including the bubonic plague and cholera epidemic.
Step-by-step explanation:
Infectious diseases have been a part of human history for thousands of years. One notable pattern is the occurrence of pandemics caused by bacterial diseases. These pandemics have had significant impacts on cities and nations throughout history. For example, the bubonic plague in the 14th century, also known as the Black Death, caused widespread death and devastation.
Another example is the cholera epidemic in the 19th century, which affected countries around the world and led to improvements in sanitation and public health measures.
Overall, the pattern of infectious diseases in history shows that bacterial pandemics have had a lasting impact on human societies.