Before revision: The target population is the population or species in which the pathogen causes disease; it is the population of interest because it suffers from disease when infected by the pathogen (for example, humans are the target population in most medical epidemiological studies).
After revision: The target population is the population or species in which the pathogen causes disease; it is the population of interest because it has disease when infected by the pathogen (for example, humans are the target population in most medical epidemiological studies).