<Anchor> In the



United States, booster shots and booster vaccinations have started for those who have received all of the corona vaccines. The main target of vaccination is the elderly and vulnerable groups, and as the US Centers for Disease Control and Prevention has stated that the definition of completed vaccination may change, there is a possibility that the number of vaccination targets may be expanded.



Correspondent Kim Soo-hyung reports from Washington.



<Reporter> As the



US Centers for Disease Control and Prevention (CDC) finalized booster shots and booster doses for Janssen and Moderna corona vaccines, booster doses for all approved vaccines in the United States have started.



Pfizer and Moderna are targeted to the elderly and vulnerable groups who have been 6 months old after the second dose of the vaccine, while the Janssen vaccine is intended for all adults 2 months after the dose.



Starting with the booster shot, cross-inoculation was also allowed to get the desired vaccine.



[Wollensky / Director, Centers for Disease Control and Prevention: Some people may prefer certain vaccines over others. With FDA approval and CDC recommendations, you can now cross-vaccinate.]



He added that the CDC can set the definition of completed inoculation one more time.



It indicated that the target of booster shot vaccination could be further expanded.



[Wollensky / Director, Centers for Disease Control and Prevention: We are still reviewing. We may need to redefine the definition of completed inoculation in the future.]



Pfizer has submitted to the Food and Drug Administration (FDA) and FDA that clinical trials conducted on children aged 5 to 11 show a 90.7% effectiveness in preventing coronavirus.



Pfizer's coronavirus vaccine for children under 12 is expected to begin early next month in the United States after the final emergency approval from regulators.