A male patient presents with severe and recurrent bacterial infections. Lab work confirms the patient is only infected with certain bacteria due to a mutation in a gene for NADPH oxidase. Which of the following is the most likely?

Correct Answer: D

Rationale: CGD, caused by NADPH oxidase mutations, leads to severe infections with catalase-positive bacteria.

Correct Answer: A

Rationale: Passive immunization involves the direct administration of preformed antibodies, such as human rabies immune globulin, to provide immediate protection, unlike active immunization which stimulates the body to produce its own antibodies.

Correct Answer: A

Rationale: The BCG (Bacillus Calmette-Guérin) vaccine is used to protect against tuberculosis, particularly severe forms in children.

Correct Answer: B

Rationale: T-cell deficiencies increase susceptibility to viruses and molds, as T cells are critical for controlling these intracellular pathogens.

Correct Answer: C

Rationale: Rheumatoid arthritis involves immune complex deposition (Type III hypersensitivity), though it's broadly an autoimmune disease; C is the best fit per the options.