Post-transplant infection risk is most strongly associated with which therapy?

• A. Immunosuppressive medication
• B. Rejection risk
• C. Immunization status
• D. Antibiotic prophylaxis

Answer: (A)

The main concept here is that suppressing the immune system directly increases infection risk. After a transplant, patients must take medications that dampen the immune response in order to prevent rejection of the new organ. This broad suppression weakens the body's defenses against bacteria, viruses, fungi, and other pathogens, making infections more likely and often more severe. The level of immunosuppression is the strongest driver of this risk, especially in the early period after transplantation when regimens are most intense.

Immunization status helps reduce some specific infection risks, and antibiotic prophylaxis can prevent certain infections during defined windows, but neither eliminates the overarching vulnerability created by immunosuppressive therapy. Rejection risk relates to how much suppression is needed, but the direct factor that increases infection risk is the immunosuppressive medications themselves.