The booster dose of the COVID-19 vaccine increases protection against hospitalizations by 80% to 90%, according to a new study from the INSPQ. This protection concerns the Omicron variant.
Posted at 1:33 p.m.
The efficiency of the 3and dose is similar regardless of the vaccine. But Quebecers who received AstraZeneca first, then messenger RNA vaccines (Pfizer, Moderna) have less protection against a mild infection, not requiring a medical consultation (72% against 77% to 82% for the mRNA).
This efficacy is equally good for all age groups, and appears to be maintained with follow-up data up to 16 weeks. Quebecers who received only two doses also have stable protection for up to 32 weeks.