The IDSA guidelines indicate that persons receiving rituximab should be considered to have high-level immunosuppression. Both inactivated and live vaccines should be withheld at least 6 months following treatment with lymphocyte depleting medications such as rituximab. As for the IG, the interval to live vaccination depends on the dose. For guidance, please refer to the Timing and Spacing of Immunobiologics section of CDC’s “General Best Practices Guidelines for Immunization”, table 3–6: “Recommended intervals between administration of antibody-containing products and measles- or varicella-containing vaccine, by product and indication for vaccination” at www.cdc.gov/vaccines/hcp/acip-recs/general-recs/timing.html. This interval could be as long as 11 months, depending on the dose he receives.