A nurse is preparing to administer a vaccine to an adult client. Which conditions should cause the nurse to delay giving a live vaccine? (Select All that Apply.)

A. Age older than 60 years alone is not a contraindication to live vaccines. In fact, some live vaccines (depending on the situation) may still be recommended in older adults. The decision is based more on immune status rather than age itself. B. Live vaccines are contraindicated during pregnancy because they contain weakened forms of the virus or bacteria that could potentially harm the fetus. Vaccination is typically postponed until after delivery. C. Clients using corticosteroids, especially in moderate to high doses or long-term therapy, are considered immunosuppressed. Administering a live vaccine in this state increases the risk that the weakened organism could cause disease. D. Recent chemotherapy suppresses the immune system, making it unsafe to receive live vaccines. The client is at risk for developing an active infection from the vaccine due to reduced immune defenses. E. A general history of allergies is not a contraindication to live vaccines unless the client has a severe allergic reaction (e.g., anaphylaxis) to a specific vaccine component. Therefore, this option is too broad and not an automatic reason to delay vaccination.