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In the fight against the corona virus, the USA will be able to use another vaccine in the future.

As a third vaccine, the FDA granted the drug from the manufacturer Johnson & Johnson an emergency approval for use in adults.

A single syringe is sufficient for the vaccine, and it can also be stored at normal refrigerator temperatures.

President Joe Biden said it was "exciting news for all Americans" and an encouraging move.

The vaccines from Biontech / Pfizer and Moderna had already been approved in the USA.

More than 66 million injections have been given across the US.

Preliminary tests by the FDA certify that the Johnson & Johnson vaccine is very effective.

According to this, the agent prevented serious illnesses by 85.9 percent in a large clinical study in the USA.

In studies in South Africa and Brazil, the effectiveness was 81.7 and 87.6 percent, respectively.

This means that the US company's vaccine also seems to work well against the South African and Brazilian virus variants, which are considered to be significantly more contagious.

Biden called on US citizens to remain cautious despite the hope of the new vaccine: "We cannot give the all-clear now or assume that victory is inevitable," he said.

The US is hardest hit by the corona pandemic worldwide, with more than half a million US citizens dying in connection with a corona infection.

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The US company Johnson & Johnson has also applied for approval in the European Union.

A decision is expected in mid-March.

Johnson & Johnson had announced that it would provide 20 million vaccine doses by the end of March and a total of 100 million vaccine doses by June.

The Johnson & Johnson vaccine uses a so-called adenovirus as a vector.

This usually triggers a common cold, but has been modified to prevent it from multiplying.

The vector sends genetic instructions to the cells to produce a specific protein of the coronavirus.

In this way the immune system is prepared to fight the real coronavirus.