The new COVID-19 omicron booster doses target both the original virus strain and two popular variants – BA.4 and BA.5.
There are two versions of the bivalent amplifier, one manufactured by Pfizer-BioNTech for people 12 years of age and older, and the other by Moderna, which is intended for people aged 18 and over. Boosters use reduced amounts of the original vaccines, and only those who have completed the first series of immunizations – two doses of Pfizer or Moderna or one dose of Johnson & Johnson vaccine – can receive a booster dose.
Experts said the side effects of the booster doses should not be too different from the initial effects of the vaccines. The most common side effects are:
- Pain in muscles and joints
The first COVID vaccine was launched in early 2021 as a two-dose series for Pfizer and Moderna or a single shot for Johnson and Johnson. As immunity weakened in patients, federal officials recommended a series of booster doses in the fall of 2021. By spring 2022, federal officials recommended a fourth injection or second booster dose for people 50 years of age and older and some high-risk groups.
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