Answer:
The main and primary factors of comorbidity include ageing.
Step-by-step explanation:
The factors of co-morbidities that make a person more susceptible to acquiring an infection is Ageing .
Comorbidity involves an individual having different ailments in the body at the same time and it is common with older people who are more susceptible to diseases such as diabetes , hypertension etc. These diseases are predisposing factors to other illnesses such as atherosclerosis, eye illnesses etc.