title: Unintended events following immunization with MMR: a systematic review.
abstract: Public debate over the safety of the trivalent measles, mumps and rubella (MMR) vaccine and the drop in vaccination rates in several countries persists despite its almost universal use and accepted effectiveness. We carried out a systematic review to assess the evidence of unintended effects (beneficial or harmful) associated with MMR and the applicability of systematic reviewing methods to the field of safety evaluation. Eligible studies were comparative prospective or retrospective on healthy individuals up to 15 years of age, carried out or published by 2003. We identified 120 articles satisfying our inclusion criteria and included 22. MMR is associated with a lower incidence of upper respiratory tract infections, a higher incidence of irritability, similar incidence of other adverse effects compared to placebo and is likely to be associated with benign thrombocytopenic purpura (TP), parotitis, joint and limb complaints and aseptic meningitis (mumps Urabe strain-containing MMR). Exposure to MMR is unlikely to be associated with Crohn's disease, ulcerative colitis, autism or aseptic meningitis (mumps Jeryl-Lynn strain-containing MMR). The design and reporting of safety outcomes in MMR vaccine studies, both pre- and post-marketing, are largely inadequate. The evidence of adverse events following immunization with MMR cannot be separated from its role in preventing the target diseases.
authors.affiliation: Reparto Epidemiologia Clinica, Istituto Superiore di Sanità, Viale Regina Elena, 299-00161 Rome, Italy. toj1@aol.com
authors.forename: Tom
authors.initials: T
authors.lastname: Jefferson
authors.forename: Deirdre
authors.initials: D
authors.lastname: Price
authors.forename: Vittorio
authors.initials: V
authors.lastname: Demicheli
authors.forename: Elvira
authors.initials: E
authors.lastname: Bianco
mesh_terms: D015982:Bias; D016022:Case-Control Studies; D015331:Cohort Studies; D004463:Ecology; D006801:Humans; D007231:Infant, Newborn; D022542:Measles-Mumps-Rubella Vaccine / Q000009:adverse effects*; D011446:Prospective Studies; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D012189:Retrospective Studies; D018433:Twin Studies as Topic; D014613:Vaccines, Attenuated / Q000009:adverse effects
chemical_list: D022542:Measles-Mumps-Rubella Vaccine; D014613:Vaccines, Attenuated