Which of the following statements is true regarding immunodeficiency disorders?

Explanation: The correct answer is b. Primary immunodeficiency disorders result from a genetic or inherited defect, while secondary immunodeficiency disorders are caused by external factors, such as infections or medications.

Incorrect choices:

a. Primary immunodeficiency disorders are present from birth and are usually genetic or inherited, while secondary immunodeficiency disorders can be acquired later in life due to external factors.

c. The manifestations and systems affected by primary and secondary immunodeficiency disorders can vary widely and are not limited to specific areas of the body.

d. Secondary immunodeficiency disorders are more common than primary immunodeficiency disorders, as they can be caused by various factors and are often associated with other medical conditions.

Explanation: The correct answer is c. Primary immunodeficiency disorders are typically present at birth or during early childhood and are caused by genetic defects that affect the function of the immune system. They are not acquired later in life due to environmental factors.

Incorrect choices:

a. Primary immunodeficiency disorders are not acquired later in life; they are usually genetic and present from birth.

b. Primary immunodeficiency disorders are characterized by a weakened or deficient immune response, not an overactive immune response.

d. Primary immunodeficiency disorders are often not easily treatable with antibiotics and antiviral medications because they result from genetic defects in the immune system.