Vaccine Contraindications and Precautions

Failing to vaccinate due to false contraindications is a major, preventable cause of under-immunization. Studies show that at the majority of visits when vaccine-preventable disease occurs, the patient had been seen by a healthcare provider who withheld vaccines due to a false contraindication. For the REx-PN exam, contraindication knowledge is tested in two ways: (1) identifying which contraindications are TRUE (requiring deferral or permanent avoidance) vs FALSE (vaccine should proceed); and (2) applying this knowledge to clinical scenarios where a patient has a condition that might seem like a contraindication but is not. The correct answer is almost always to vaccinate when the condition is a false contraindication. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one...