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President Putin said one of his daughters had been vaccinated against the virus. Photo: Reuters.

Mr Putin said the vaccine had passed all the required checks, adding that his daughter had already been given it.

Officials have said they plan to start mass vaccination in October.

Experts have raised concerns about the speed of Russia's work, suggesting that researchers might be cutting corners.

Amid fears that safety could have been compromised, the World Health Organization (WHO) urged Russia last week to follow international guidelines for producing a vaccine against Covid-19.

On Tuesday, the WHO said it had been in talks with Russian authorities about undertaking a review of the vaccine, which has been named Sputnik-V.

Currently, the Russian vaccine is not among the WHO's list of six vaccines that have reached phase three clinical trials, which involve more widespread testing in humans.

More than 100 vaccines around the world are in early development, with some of those being tested on people in clinical trials.

Despite rapid progress, most experts think any vaccine would not become widely available until mid-2021.

What did President Putin say about the vaccine?

Calling it a world first, President Putin said the vaccine, developed by Moscow's Gamaleya Institute, offered "sustainable immunity" against the coronavirus.

He said he knew the vaccine was "quite effective", without giving further details, and stressed that it had passed "all needed checks".

Mr Putin also said the vaccine had been given to one of his daughters, who was feeling fine despite a brief temperature increase.

 

"I think in this sense she took part in the experiment," Mr Putin said, without specifying which of his two daughters had received the vaccine.

"After the first injection her temperature was 38 degrees, the next day 37.5, and that was it. After the second injection her temperature went up slightly, then back to normal."

It is rare for President Putin to talk publicly about his daughters - named Maria Vorontsova and Katerina Tikhonova in media reports - and their lives have been shrouded in secrecy.

What do we know about the vaccine?

Russian scientists said early-stage trials of the vaccine had been completed and the results were a success.

The Russian vaccine uses adapted strains of the adenovirus, a virus that usually causes the common cold, to trigger an immune response.

But the vaccine's approval by Russian regulators comes before the completion of a larger study involving thousands of people, known as a phase-three trial.

Experts consider these trials an essential part of the testing process.

Despite this, Russian Health Minister Mikhail Murashko said on Tuesday the vaccine had "proven to be highly effective and safe", hailing it as a big step towards "humankind's victory" over Covid-19.

Russian officials said the vaccine had been named Sputnik-V, in honour of the world's first satellite. Sputnik is the Russian word for satellite.

They have likened the search for a vaccine to the space race contested by the Soviet Union and the US during the Cold War.

Russia has previously been accused by the UK, US and Canada of seeking to steal research related to Covid-19. BBC

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