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The US Food and Drug Administration (FDA) authorized this Tuesday the second booster dose (which becomes the fourth, after the two of the complete schedule) of Pfizer's Covid-19 vaccines/ BioNTech and Moderna for those

over 50

and some immunosuppressed.

The second booster vaccine can begin to be administered

four months after the first

, that is, after the third injection, the agency reported in a statement.

Regarding

immunosuppressed

people , the FDA authorized the

second Pfizer booster for those over 12 years of age

who have undergone an organ transplant and the Moderna booster for those over 18 years of age with the same level of immunosuppression.

According to the US regulator, scientific evidence suggests that there is

"some decrease in protection"

of vaccines over time, so a second booster "would help increase the levels of protection for people at higher risk."

Furthermore, he stated that "the benefits" of a second booster dose "outweigh the risks" of its application.

In making this decision, the FDA relied on data provided by the

Israeli Ministry of Health

, which already administers second Pfizer booster doses to adults, and independent studies on Moderna, among other analyses.

The United States began applying the first booster doses

in September of last year

for people at higher risk, and currently everyone over 12 years of age who has completed their vaccination schedule can receive it.

According to data from the Centers for Disease Control and Prevention (CDC),

65.5% of the US population has completed the vaccination schedule, and

44.8% of them have received their first booster dose.

).

Last February, the CDC concluded in a study that the effectiveness of the reinforcements decreased after four months of supply.

The United States is the country hardest hit by the pandemic in absolute numbers, with

80 million infections and 944,000 deaths

, according to a count by Johns Hopkins University.

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