Answer:
(Answers may vary.) 
In my research, I found that primary deficiencies are present at birth (congenital). Genetic defects cause these deficiencies. They are rare and occur in infants and children. Secondary immunodeficiencies are caused by environmental factors. Some factors are poor diet and certain medications or diseases. They are more common than primary immunodeficiencies and may develop at any age. 
 
The following common diseases can cause a secondary immunodeficiency: 
 
cancers 
HIV infection 
hepatitis 
burns 
diabetes 
chronic kidney disease 
rheumatoid arthritis 
lupus 
leukemia 
malnutrition 
Some actions can prevent an immune deficiency: 
 
Eat a healthy diet with plenty of fruits and vegetables. 
Avoid people with infections (such as colds). 
Wash your hands frequently. 
Obtain adequate sleep (about 8 hours). 
Practice safe-sex.
Step-by-step explanation:
its what the website gave me