In the United States allowed the third dose of vaccine for adolescents
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The US Centers for Disease Control and Prevention (CDC) has expanded its Pfizer booster campaign to target teens aged 12-15.
Previously, a panel of experts recommended that a third dose of vaccine be administered five months after the second.
The CDC also called for strengthened recommendations for booster vaccinations for children aged 16 and 17.
In a statement The center, unveiled on January 5, said it is now recommended for teenagers aged 12-17 to receive a third dose of the vaccine.