Question

which describes the correct order of events in the spread of disease?
pathogens → exposure → sickness
sickness → pathogens → exposure
exposure → sickness → transmission
transmission → exposure → sickness

Explanation:

For a disease to spread, first there must be pathogens (disease - causing agents). Then, there is exposure of a susceptible host to these pathogens. After exposure, if the host's immune system is unable to fight off the pathogens, sickness occurs.

Answer:

pathogens → exposure → sickness