The US FDA = Food and Drug Administration announced on the 29th that it will allow a fourth dose of the new coronavirus vaccine from Pfizer and Moderna in the United States for people over the age of 50.

The so-called mRNA vaccines of Pfizer and Moderna maintain a high level of effectiveness in preventing aggravation and death even for Omicron strains by giving two inoculations and additional inoculations to enhance the effect. However, it has been pointed out that the effect may decrease as time passes after inoculation.

On the 29th, the FDA granted an emergency use of both companies' vaccines to enable a second boost in total for people over the age of 50, more than four months after the first boost. Announced that it has been revised.

Regarding the reason for the permit, FDA experts said, "Many people over the age of 50 have an underlying disease that leads to an increased risk of aggravation." "The spread of infection is occurring again in the United Kingdom and parts of Asia. To provide a means for people to protect themselves by enabling a second booster. "

In addition, the FDA has allowed a second booster vaccination for people under the age of 50 who are immunocompromised, such as by undergoing an organ transplant.