One cross-sectional and one cohort study assessed the immunogenicity of themeasles, mumps and rubella (MMR) vaccination and the diphtheria, tetanus andpertussis (DTP) vaccination in 79 PRD patients, on glucocorticoids, conventionalDMARDs and bDMARDs (TNF inhibitors and Abatacept) in comparison to 48controls.24,30 The safety of the measles, mumps, rubella, tetanus anddiphtheria vaccines was assessed in 263 children with PRD on all PRD therapiesin comparison to 17 controls.25 Here, TNF is linked to tetanus.