Primary immunodeficiency is acquired later in life, while secondary immunodeficiency is present at birth
Primary immunodeficiency is a result of genetic defects in the immune system, while secondary immunodeficiency is associated with external factors that impair the immune function
Primary immunodeficiency is caused by factors such as infections, medications, or underlying diseases, while secondary immunodeficiency is usually due to genetic mutations
Primary immunodeficiency can be managed with immunosuppressive therapy, while secondary immunodeficiency often requires bone marrow transplantation