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The FDA has formally approved the single-shot Johnson & Johnson Covid-19 vaccine, the third to be authorized in the US.

The vaccine is set to be a cost-effective alternative to the Pfizer and Moderna vaccines, and can be stored in a refrigerator instead of a freezer.

Trials found the vaccine prevented serious illness but was 66% effective overall when moderate cases were included.

It is made by the Belgian firm Janssen.

Johnson & Johnson has agreed to provide the US with 100 million doses by the end of June. The first doses could be available to the public as early as next week.

The UK, EU and Canada have also ordered doses, and 500 million doses have also been ordered through the Covax scheme to supply poorer nations.

President Joe Biden hailed it as “exciting news for all Americans, and an encouraging development”, but warned that the “fight is far from over”.

He said in a statement: “Though we celebrate today’s news, I urge all Americans – keep washing your hands, stay socially distanced, and keep wearing masks..

“As I have said many times, things are still likely to get worse again as new variants spread, and the current improvement could reverse.”

The FDA authorization came after an external committee of exerts unanimously backed the vaccine on February 27.

Results from trials conducted in the US, South Africa and Brazil showed it was more than 85% effective at preventing serious illness, and 66% effective overall when moderate cases were included.

Notably, there were no deaths among participants who had received the vaccine and no hospital admissions after 28 days post-vaccine.

Overall protection was lower in South Africa and Brazil, where virus variants have become dominant, but defense against severe or critical illness was “similarly high”.

Single-Dose Janssen Vaccine Shows 66% Effectiveness Against Covid-19

South Africa began administering the unapproved Johnson & Johnson vaccine to healthcare workers as part of a study earlier this month. It came after early trials suggested the Oxford-AstraZeneca vaccine offered “minimal protection” against mild disease from the variant dominant in large parts of the country.

So far the only other country to approve the Johnson & Johnson vaccine for emergency use is Bahrain, which gave it the green light on February 25.

Because the vaccine will require fewer doses than its two-shot Pfizer and Moderna counterparts, it will also require fewer vaccine appointments and medical staff.

The Johnson & Johnson vaccine uses a common cold virus that has been engineered to make it harmless.

It then safely carries part of the coronavirus’s genetic code into the body. This is enough for the body to recognize the threat and then learn to fight coronavirus.

This trains the body’s immune system to fight coronavirus when it encounters the virus for real.

This is similar to the approach used by the University of Oxford and AstraZeneca.

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Janssen’s single dose Covid-19 vaccine is 66% effective, the Belgian company has announced.

However, nobody needed hospital treatment or died from coronavirus after the vaccine took effect in the international trial.

Crucially, the trial looked at giving just one dose of the vaccine, which makes it significantly easier to roll out than those requiring two.

Although there are also signs the vaccine is less effective against the new variant that is spreading in South Africa.

The news comes shortly after Novavax announced their vaccine was 89% effective overall in the UK and 60% in South Africa. Both new vaccines will need to be reviewed by regulators before they can be used.

Janssen, a pharmaceutical company owned by Johnson & Johnson, is also investigating whether giving two doses will give either stronger or longer-lasting protection.

The fact the vaccine works as a single dose and can be kept in a standard fridge, while others need super-cold storage, means the vaccine could have a significant role around the world.

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Dr. Paul Stoffels, the chief scientific officer at Johnson & Johnson, said: “A one-shot vaccine is considered by the World Health Organization to be the best option in pandemic settings.”

He added the vaccine could “potentially protect hundreds of millions of people from serious and fatal outcomes of Covid-19”.

Janssen is aiming to make one billion doses in 2021.

The Janssen vaccine uses a common cold virus that has been engineered to make it harmless.

The vaccine then safely carries part of the coronavirus’s genetic code into the body. This is enough for the body to recognize the threat and then learn to fight coronavirus.

This trains the body’s immune system to fight coronavirus when it encounters the virus for real.

This is similar to the approach used by the University of Oxford and AstraZeneca.

Dr Mathai Mammen, from Janssen, said: “A single dose regimen with fast onset of protection and ease of delivery and storage provides a potential solution to reaching as many people as possible.

“The ability to avoid hospitalizations and deaths would change the game in combating the pandemic.”

The results are based on nearly 44,000 people who took part in the trial and 468 cases of Covid-19.

However, the Janssen vaccine was just 57% effective in the South African part of the trial, where a new version of the coronavirus is spreading, compared with 72% in the US.

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