US President Joe Biden, 78, received the third dose of the "Pfizer" vaccine against the Corona virus, and television networks transmitted the events of the event live on Monday, with the aim of encouraging Americans entitled to receive this booster dose to do so.

And before receiving the third booster dose of the vaccine at the White House, Biden joked about his age, "I know it doesn't look like that, but I'm over 65."

He explained that the first lady, Jill Biden, will in turn receive the third dose of the vaccine.

Biden added that "the booster doses are important, but the most important thing is that we can vaccinate more people," explaining that he will travel on Wednesday to Chicago "to say why more companies should impose mandatory vaccination."

Biden had received his first dose of the Pfizer vaccine in December of last year, and the second in the previous January, when he was still elected president.

And the US President announced last week that about 60 million people in the United States are eligible to receive a booster dose of Pfizer.

He pointed out that people who received doses of the "Moderna" or "Johnson & Johnson" vaccines can receive booster doses once the studies are completed, expecting that all Americans will be eligible for that "soon."

And the US health authorities issued recommendations to provide a booster dose for three categories of people, for those aged 65 and over, for those between the ages of 18 and 64 who suffer from diseases or conditions such as diabetes or obesity, and for those most vulnerable to infection with the virus because of their work or place of residence.

And the US Centers for Disease Control and Prevention (CDC) said last Friday that data on booster doses from Moderna and Johnson & Johnson will be evaluated "in the coming weeks."

It is noteworthy that mandatory vaccination is not imposed in the United States at the federal level, although this tool is considered essential to increase the number of vaccinated people in the country.

Biden wants to launch a massive Pfizer and Moderna booster campaign this week for all Americans.

But US health authorities suspended the move, dividing medical experts and creating confusion over the booster-dose policy.