Which of the following patients should not receive live vaccines?

Rationale: A. Immunocompromised individuals, such as those with HIV/AIDS or certain malignancies, possess weakened immune systems that may not effectively control the replication of a live attenuated pathogen. Administering a live vaccine to these patients could lead to severe, uncontrolled systemic infection rather than the intended immunity. Scientific guidelines mandate the use of inactivated or subunit vaccines to ensure patient safety in these populations. B. Pregnant patients are generally advised against receiving live vaccines because of the theoretical risk of the attenuated virus crossing the placenta and infecting the developing fetus. While actual instances of fetal harm are rare, the medical standard of care prioritizes safety during gestation. Essential vaccines like the MMR and varicella should be administered either prior to conception or in the immediate postpartum period. C. High-dose corticosteroids exert a significant lympholytic effect and suppress the overall inflammatory response, which compromises the body's ability to handle even weakened live viruses. Patients on dosages equivalent to ≥ 20 mg of prednisone daily for more than 14 days are considered functionally immunosuppressed. Live vaccination must be delayed until the steroid therapy is discontinued and the immune system has had sufficient time to recover. D. All of the populations mentioned share a common vulnerability that makes the administration of live attenuated vaccines clinically inappropriate and potentially dangerous. The physiological state of pregnancy and the various forms of immunosuppression—whether disease-induced or pharmacological—interfere with the safe processing of live agents. Each of these categories represents a high-risk group where the potential for vaccine-induced illness outweighs the preventative benefits.