| U.S. Food and Drug Administration (FDA) | Federal agency of the Department of Health and Human Services for protecting the public health. |
| Vaccine Knowledge Project | A source of independent information about vaccines and infectious diseases managed by Oxford Vaccine Group. |
| Electronic medicines compendium (emc) | It hosts medicines information licensed for use in the UK. |
| Vaxquery component of VIOLIN | The Vaccine Investigation and Online Information Network. |
| World Health Organisation (WHO) | Specialized agency of the United Nations responsible for international public health. |
| FDA Thailand | Thai Food and Drug Administration of the Ministry of Public Health. |
| ClinicalTrials.gov | Database of privately and publicly funded clinical studies conducted around the world. |