Results of a CDC-funded study entitled “A Clinical Analysis of Gelatin Allergy and Determination of its Causal Relationship to the Previous Administration of Gelatin-Containing Acellular Pertussis Vaccine Combined with Diphtheria and Tetanus Toxoids” concludes

Results of a CDC-funded study entitled “A Clinical Analysis of Gelatin Allergy and Determination of its Causal Relationship to the Previous Administration of Gelatin-Containing Acellular Pertussis Vaccine Combined with Diphtheria and Tetanus Toxoids” concludes:
“Most anaphylactic reactions and some urticarial reactions to gelatin-containing measles, mumps and rubella monovalent vaccines are associated with IgE-mediated gelatin allergy. DTaP immunization histories suggest that the gelatin-containing DTaP vaccine may have a causal relationship to the development of this gelatin allergy.”
Study: https://www.ncbi.nlm.nih.gov/pubmed/9949325
A clinical analysis of gelatin allergy and determination of its causal relationship to the previous administration of gelatin-containing acellular pertussis vaccine combined with diphtheria and tetanus toxoids.
RESULTS:
The 366 reported patients were categorized as follows: 34 with anaphylaxis, 76 with urticaria, 215 with nonurticarial generalized eruption, and 41 with local reactions only. In 206 patients from whom serum was available, IgE antibodies to gelatin were detected in 25 of 27 (93%) with anaphylaxis, 27 of 48 (56%) with urticaria, and 8 of 90 (9%) with a generalized eruption. None of a group of 41 patients with only local reactions at the injected site and none of a control group of 29 subjects with no adverse reaction had such antibodies. Among 202 patients for whom prior vaccine information was available, all had received DTaP vaccines. Among those for whom the prior DTaP vaccine could be determined to contain gelatin or be free of gelatin, 155 of 158 (98%) subjects had received gelatin-containing DTaP vaccines. This rate is higher than would be expected on the basis of the market share of gelatin-containing (vs gelatin-free) DTaP vaccines (75%). Furthermore, before 1993, when a trivalent measles, mumps, and rubella vaccine (with the same 0.2% gelatin content as the monovalent vaccines) was used and administered before DTaP vaccination, no reports of anaphylaxis to the measles, mumps, and rubella vaccine were received.
CONCLUSION:
Most anaphylactic reactions and some urticarial reactions to gelatin-containing measles, mumps, and rubella monovalent vaccines are associated with IgE-mediated gelatin allergy. DTaP immunization histories suggest that the gelatin-containing DTaP vaccine may have a causal relationship to the development of this gelatin allergy.

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Diphtheria and Tetanus DTaP Toxoids and Acellular Pertussis Vaccine Adsorbed

Adverse events reported during post-approval use of Tripedia vaccine include idiopathic thrombocytopenic purpura, SIDS, anaphylactic reaction, cellulitis, autism, convulsion/grand mal convulsion, encephalopathy, hypotonia, neuropathy, somnolence and apnea. Events were included in this list because of the seriousness or frequency of reporting. Because these events are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequencies or to establish a causal relationship to components of Tripedia vaccine

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