Recommendations on the use of Moderna Spikevax BA.4/5 bivalent mRNA (50 mcg) COVID-19 booster vaccine in adultsRecommendations as of November 3, 2022. Post author By NACI Post date 5 December 2022 ← Recommendations on the use of Pfizer-BioNTech Comirnaty (3 mcg) COVID-19 vaccine in children 6 months to 4 years of age → Ministry for Seniors and Accessibility COVID-19 Guidance Document for Retirement Homes in Ontario