The Ministère de la Santé et des Services sociaux (MSSS) recently asked the CIQ to issue an opinion on the target interval before administration of the second dose, and important considerations to be taken into account for decision-making. The purpose of this opinion is to answer this question through an analysis of the most recent data on COVID-19 vaccine effectiveness from Quebec and abroad.
The data available on the efficacy of mRNA vaccines against COVID-19 in Phase 3 studies (clinical studies) and their effectiveness in studies monitoring the rollout (public health programs) remain limited at present time. It is, however, possible to identify certain preliminary trends:
- The VE of a single dose of mRNA vaccines against COVID-19 appears high in...