Clinical trials showed that beginning 2 weeks after the second dose, the Moderna Spikevax ® COVID vaccine was: A different vaccine may be offered for your second dose. For example, you may have received Pfizer-BioNTech Comirnaty ® as your first dose and be offered Moderna Spikevax ® as your second. This is known as a mixed vaccine series.

Call emergency services if you develop or witness any serious symptoms that could be anallergic reactionafter vaccination. Reporting a possible serious reaction to 11 years (25 micrograms at least 6 months after their previous dose) Moderna Spikevax ®Bivalent COVID-19 vaccine (Original/Omicron BA.1), Moderna Spikevax ®Bivalent COVID-19 vaccine (Original/Omicron BA.4/5) Omicron XBB.1.5 subvariant vaccine doses years and older (50 micrograms at least 4 months after their previous dose) Moderna Spikevax ®COVID-19 vaccine, Moderna Spikevax ®Bivalent COVID-19 vaccine (Original/Omicron BA.1), Moderna Spikevax ®Bivalent COVID-19 vaccine (Original/Omicron BA.4/5)Reported allergic reactions and side effects to COVID-19 vaccines are published weekly in our Reported side effects following COVID-19 vaccination report. Vaccine review, approval and monitoring The Moderna Spikevax ® Bivalent COVID-19 vaccine (Original/Omicron BA.1) is approved as a booster for people who are 6 years of age and older. Its safety and effectiveness in younger people has not yet been established. Moderna Spikevax ®Bivalent COVID-19 vaccine (Original/Omicron BA.4/5) Its safety and effectiveness in people younger than 6 months has not yet been established. Effectiveness The bivalent Original/Omicron BA.4/5 0.1 mg/mL multi-dose vial has a royal blue plastic cap and grey label. The bivalent Original/Omicron BA.1 0.1 mg/mL multi-dose vial has a royal blue plastic cap and green label.

months to 4 years (25 micrograms at least 6 months after their previous dose). If the child has not been previously vaccinated, Spikevax XBB.1.5 should be administered a 2-dose regimen.The mRNA sequence from Moderna Spikevax ® COVID-19 vaccine is also included in the Moderna Spikevax ®Bivalent COVID-19 vaccine (Original/Omicron BA.1). The bivalent booster also has an additional mRNA sequence that targets the Omicron BA.1 variant.