Inactivated vaccines should be given at least how long before starting immunosuppressive therapy?

• A. 1 week
• B. 2 weeks
• C. 3 weeks
• D. 4 weeks

Answer: (B)

Before starting immunosuppressive therapy, you want the immune system to respond to the vaccine and develop protective antibodies. For inactivated vaccines, the body typically needs about 10–14 days to mount a primary antibody response and reach protective levels. If therapy begins sooner, immunosuppression can blunt that response, reducing vaccine effectiveness. Therefore, the recommended minimum interval is two weeks before starting therapy. Waiting at least this long gives the immune system time to seroconvert, while longer waits aren’t usually necessary for most standard inactivated vaccines. (Note: live vaccines are a different consideration and are typically avoided during immunosuppression.)