Birdwatch Note Rating
2024-12-07 16:26:26 UTC - HELPFUL
Rated by Participant: 1F4492DF78D0B1DCC633C5B76486C11308C2C6D91EB0039FF44F3AFFA94EEF15
Participant Details
Original Note:
The first generation of vaccines is tested against a placebo but future generations of the same vaccine are tested against their previous generation, because it is not ethical to expose patients to vaccine preventable diseases once vaccinations are available. https://www.canada.ca/en/public-health/services/immunization/national-advisory-committee-on-immunization-naci.html
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