| AAFP | American Academy of Family Physicians |
| AAP | American Academy of Pediatrics |
| ACIP | U.S. Advisory Committee on Immunization Practices |
BCG | bacillus Calmette-Guérin |
CDC | Centers for Disease Control and Prevention |
| CISA | Clinical Immunization Safety Assessment Network |
| CPRD | Clinical Practice Research Datalink (United Kingdom) |
| CRS | Danish Civil Registration System |
DT | diphtheria and tetanus toxoids absorbed |
| DTaP | diphtheria and tetanus toxoids and acellular pertussis vaccine |
| DTP | diphtheria and tetanus toxoids and whole-cell pertussis vaccine |
EHR | electronic health record |
| EMR | electronic medical record |
FDA | Food and Drug Administration |
GPRD | General Practice Research Database (United Kingdom) |
| GRADE | Grading of Recommendations Assessment, Development, and Evaluation |