How can Kiovig (human immunoglobulin) affect the effectiveness of live vaccines such as measles, mumps, rubella and varicella?

Kiovig may reduce live attenuated measles, mumps, rubella and varicella vaccine effectiveness for at least 6 weeks and up to 3 months, so vaccination should wait 3 months after administration; measles vaccine impairment may persist for up to 1 year, requiring antibody status checks.