Final answer:
The correct order of events in the spread of disease is exposure -> sickness -> transmission.
Step-by-step explanation:
The correct order of events in the spread of disease is exposure → sickness → transmission.
First, a person is exposed to the pathogen, which means they come into contact with it. This can happen through various routes such as direct contact, airborne transmission, or ingestion. After exposure, the person may develop sickness, which refers to the signs and symptoms of the disease.
Once the person is sick, the pathogen can be transmitted to others. This can occur through direct contact with the infected individual, through the air, or via contaminated objects or food.