Russian President Vladimir Putin has received a booster shot against COVID-19 virus, Russian news agencies said.

According to local media reports, Putin said he has been revaccinated with Sputnik Light vaccine.

“Today, on your recommendation and that of your colleagues, I got another vaccination, Sputnik Light. This is called revaccination," Putin was quoted as saying by state-owned Russian&nbsp;News Agency TASS after meeting with the deputy director of the Gamaleya Research Centre for Epidemiology and Microbiology, which developed both vaccines.

Also read |&nbsp;<a href="https://www.wionews.com/world/putin-orders-week-long-paid-holiday-in-russia-to-combat-virus-surge-422430">Putin orders week-long paid holiday in Russia to combat virus surge</a>

"I was revaccinated two hours ago. I feel nothing. I am in normal condition. Everything is all right," he added.

Putin&nbsp;received his second dose of Covid vaccine in April of this year, though at the time he did not disclose which vaccine he received.

A Kremlin spokesperson said they were deliberately not saying which vaccine Putin received, saying all three COVID-19 vaccines available in Russia were good options.

Also read |&nbsp;<a href="https://www.wionews.com/world/russia-reports-highest-daily-covid-deaths-as-delta-variant-surges-418674">Russia reports highest daily Covid deaths as Delta variant surges</a>

The Sputnik Light is a one-shot COVID-19 vaccine. It has been authorised for use in more than 15 countries with the registration process on in another 30 countries.

Russia first announced the deployment of COVID-19 vaccine booster shots in July, terming the shots "Sputnik Light." The jabs were made available to individuals who had been fully vaccinated&nbsp;at least six months ago.

On Friday, November 12, Putin had urged the World Health Organization (WHO) to speed the approval of new COVID-19 vaccines. He added that access to dosages in impoverished nations is limited due to unjust compassion.&nbsp;

(With inputs from agencies)

Russian President Vladimir Putin has received a booster shot against COVID-19 virus, Russian news agencies said. According to local media reports, Putin said he has been revaccinated with Sputnik Light vaccine.

Russian President Vladimir Putin has received a booster shot against COVID-19 virus, Russian news agencies said. According to local media reports, Putin said he has been revaccinated with Sputnik Light vaccine. “Today, on your recommendation and that of your colleagues, I got another vaccination, Sputnik Light. This is called revaccination," Putin was quoted as saying by state-owned Russian News Agency TASS after meeting with the deputy director of the Gamaleya Research Centre for Epidemiology and Microbiology, which developed both vaccines. Also read | Putin orders week-long paid holiday in Russia to combat virus surge "I was revaccinated two hours ago. I feel nothing. I am in normal condition. Everything is all right," he added. Putin received his second dose of Covid vaccine in April of this year, though at the time he did not disclose which vaccine he received. A Kremlin spokesperson said they were deliberately not saying which vaccine Putin received, saying all three COVID-19 vaccines available in Russia were good options. Also read | Russia reports highest daily Covid deaths as Delta variant surges The Sputnik Light is a one-shot COVID-19 vaccine. It has been authorised for use in more than 15 countries with the registration process on in another 30 countries. Russia first announced the deployment of COVID-19 vaccine booster shots in July, terming the shots "Sputnik Light." The jabs were made available to individuals who had been fully vaccinated at least six months ago. On Friday, November 12, Putin had urged the World Health Organization (WHO) to speed the approval of new COVID-19 vaccines. He added that access to dosages in impoverished nations is limited due to unjust compassion. (With inputs from agencies)

Russian President Putin gets booster shot, revaccinated with Sputnik Light

As Russian experts claimed that Sputnik Light is more efficient against the deadly Delta variant of coronavirus, than other western vaccines, they also assured that Russia is happy to share its technology with the world.<o:p></o:p>

Talking about sharing vaccine technology with the world, Kirill Dmitriev, CFO, Russian Direct Investment Fund (RDIF) said that the company has offered full transfer of the Sputnik V technology with more than 10 countries.

<o:p>Also read |&nbsp;<a href="https://www.wionews.com/world/universal-booster-sputnik-lights-efficacy-higher-than-other-vaccines-experts-claim-420460">'Universal booster': Sputnik Light's efficacy higher than other vaccines, experts claim</a></o:p>

"We are producing it not only in Russia, but we are producing in more than 10 countries. So, 20 producers in more than 10 countries are producing Sputnik Light shot, including Serum Institute which is the largest vaccine producer of the world,"&nbsp;Dmitriev said. <o:p></o:p>

He also talked about the importance of finishing the concept of monopoly markets with respect to Covid vaccines. People around the world are suffering and at such a time it is the moral duty of medical experts to supply and help other countries with vaccines rather than profiting out of monopoly markets, the expert said.

<o:p><a href="https://www.wionews.com/videos/russian-president-vladimir-putin-says-country-needs-to-step-up-vaccination-campaign-420336">WATCH |</a></o:p>

<div class="videoWrapper trancodeVideo"><iframe allowfullscreen="" autoplay="1" class="includeVideo" frameborder="0" height="350" src="https://www.wionews.com/videos/russian-president-vladimir-putin-says-country-needs-to-step-up-vaccination-campaign-420336/embed" style="width:100%;max-width:560px;" width="560"></iframe></div>

"We believe that monopoly is bad because it increases prices. Monopolies are less efficient and if you have seen the decline in some of the mRNA vaccines in five months, it shows that monopolies need some other players to actually partner with them and help with the efficacy," Dmitriev said. "We cannot live in a world where vaccine efficacy declines dramatically below 50 per cent in five months. We need to have a more pragmatic and efficient solution and Sputnik Light is one such solution that can be a booster to others."<o:p></o:p>

The expert also claimed that Russia has shared that vaccine technology with 10 different countries as it believes that technological transfer is the key to breaking monopolies. He also said that Russia hopes this will set an example for other vaccine manufacturers and countries and encourage them to follow the suit.

<o:p></o:p>

During a virtual press conference, the experts also claimed that&nbsp;"Sputnik Light, a one-shot vaccine, is efficient against the Delta with 70 per cent efficacy, and for people with age 60 and below, its efficacy is 75 per cent. So, those are actually very high efficacy numbers," said Kirill Dmitriev.

As Russian experts claimed that Sputnik Light is more efficient against the deadly Delta variant of coronavirus, than other western vaccines, they also assured that Russia is happy to share its technology with the world.

As Russian experts claimed that Sputnik Light is more efficient against the deadly Delta variant of coronavirus, than other western vaccines, they also assured that Russia is happy to share its technology with the world. Talking about sharing vaccine technology with the world, Kirill Dmitriev, CFO, Russian Direct Investment Fund (RDIF) said that the company has offered full transfer of the Sputnik V technology with more than 10 countries. Also read | 'Universal booster': Sputnik Light's efficacy higher than other vaccines, experts claim "We are producing it not only in Russia, but we are producing in more than 10 countries. So, 20 producers in more than 10 countries are producing Sputnik Light shot, including Serum Institute which is the largest vaccine producer of the world," Dmitriev said. He also talked about the importance of finishing the concept of monopoly markets with respect to Covid vaccines. People around the world are suffering and at such a time it is the moral duty of medical experts to supply and help other countries with vaccines rather than profiting out of monopoly markets, the expert said. WATCH | "We believe that monopoly is bad because it increases prices. Monopolies are less efficient and if you have seen the decline in some of the mRNA vaccines in five months, it shows that monopolies need some other players to actually partner with them and help with the efficacy," Dmitriev said. "We cannot live in a world where vaccine efficacy declines dramatically below 50 per cent in five months. We need to have a more pragmatic and efficient solution and Sputnik Light is one such solution that can be a booster to others." The expert also claimed that Russia has shared that vaccine technology with 10 different countries as it believes that technological transfer is the key to breaking monopolies. He also said that Russia hopes this will set an example for other vaccine manufacturers and countries and encourage them to follow the suit. During a virtual press conference, the experts also claimed that "Sputnik Light, a one-shot vaccine, is efficient against the Delta with 70 per cent efficacy, and for people with age 60 and below, its efficacy is 75 per cent. So, those are actually very high efficacy numbers," said Kirill Dmitriev.

'Breaking monopolies': Russian experts boast about technology sharing of Sputnik vaccine

As the demand for booster shots of Covid vaccines increase, Russia's Sputnik Light has declared that this single-shot vaccine is enough on its own, and can also be used as a booster shot with other western vaccines.<o:p></o:p>

In a press conference, the CFO of Russian Direct Investment Fund, reported that new data from Gamaleya Center shows that a single shot of the Sputnik Light Covid vaccine is 70 per cent effective against the Delta variant.<o:p></o:p>

"Sputnik Light, a one-shot vaccine, is efficient against the Delta with 70 per cent efficacy, and for people with age 60 and below, its efficacy is 75 per cent. So, those are actually very high efficacy numbers," said Kirill Dmitriev, CFO, Russian Direct Investment Fund (RDIF). "It shows that one-shot Sputnik V vaccine shows high efficacy against Delta variant than two shots of many other vaccines, and Sputnik Lite shows high efficacy against many other two-shot vaccines."

<o:p>Also read |&nbsp;<a href="https://www.wionews.com/world/old-fake-news-sputnik-v-refutes-claims-russia-stole-oxford-vaccine-blueprint-419855">'Old fake news': Sputnik V refutes claims Russia stole Oxford vaccine blueprint</a></o:p>

This becomes more important as several other vaccines, the Russian company claims, have shown a decline in the efficacy against the deadly Delta variant to less than 50 per cent, five months after the shot.<o:p></o:p>

Considering the high efficacy of the Sputnik Light vaccine, the one-shot vaccine can also be sued as a booster shot for several other vaccines, the organisation claimed.

<o:p></o:p>

<div class="ui-state-default" contenteditable="false">
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<blockquote class="twitter-tweet">
BREAKING | RDIF: New data from Gamaleya Center shows 1-shot Sputnik Light vaccine, 1st component of <a href="https://twitter.com/hashtag/SputnikV?src=hash&amp;ref_src=twsrc%5Etfw">#SputnikV</a>, is 70% effective against the Delta strain 3 months after injection, making it оne of the world’s leading standalone vaccines &amp; and ideal booster for other vaccines. <a href="https://t.co/1u6HC0NpXS">pic.twitter.com/1u6HC0NpXS</a>
— Sputnik V (@sputnikvaccine) <a href="https://twitter.com/sputnikvaccine/status/1448264759590203396?ref_src=twsrc%5Etfw">October 13, 2021</a></blockquote>
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"As a standalone, Sputnik Light is a great fighter against the Delta variant, based on this data and this is particularly important because in addition to being a standalone vaccine, Sputnik V can also be a booster to other vaccines,"&nbsp;Dmitriev said. "Booster is much needed by the world because many other vaccines show decline of efficacy to 68 per cent on month three and Sputnik Light is efficient against 70 per cent against Delta on month three of vaccine. So, mRNA vaccines need booster and Sputnik Light can be a booster to mRNA and other vaccines."

<o:p><a href="https://www.wionews.com/videos/russian-president-vladimir-putin-says-country-needs-to-step-up-vaccination-campaign-420336">WATCH |</a></o:p>

<div class="videoWrapper trancodeVideo"><iframe allowfullscreen="" autoplay="1" class="includeVideo" frameborder="0" height="350" src="https://www.wionews.com/videos/russian-president-vladimir-putin-says-country-needs-to-step-up-vaccination-campaign-420336/embed" style="width:100%;max-width:560px;" width="560"></iframe></div>

He also reminded the world that Russia’s Gamaleya Research Institute of Epidemiology and Microbiology was the first in the world to suggest combination of different vaccines. The institute was also the first to start clinical trials with AstraZeneca in February. Currently, the Russian experts are running clinical trials with Argentina of Sputnik Light as a booster shot with Sinopharm, Moderna and more.<o:p></o:p>

"Those trials show very nice safety and efficacy results and we believe that if Sputnik Light is used as a booster, it will have efficacy similar to Sputnik V original vaccine, which is 83 per cent against infections and 94 per cent against hospitalisations,"&nbsp;Dmitriev claimed. He also said that the experts believe that Sputnik Light is positioned to a 'universal booster'.<o:p></o:p>

As the demand for booster shots of Covid vaccines increase, Russia's Sputnik Light has declared that this single-shot vaccine is enough on its own, and can also be used as a booster shot with other western vaccines.

As the demand for booster shots of Covid vaccines increase, Russia's Sputnik Light has declared that this single-shot vaccine is enough on its own, and can also be used as a booster shot with other western vaccines. In a press conference, the CFO of Russian Direct Investment Fund, reported that new data from Gamaleya Center shows that a single shot of the Sputnik Light Covid vaccine is 70 per cent effective against the Delta variant. "Sputnik Light, a one-shot vaccine, is efficient against the Delta with 70 per cent efficacy, and for people with age 60 and below, its efficacy is 75 per cent. So, those are actually very high efficacy numbers," said Kirill Dmitriev, CFO, Russian Direct Investment Fund (RDIF). "It shows that one-shot Sputnik V vaccine shows high efficacy against Delta variant than two shots of many other vaccines, and Sputnik Lite shows high efficacy against many other two-shot vaccines." Also read | 'Old fake news': Sputnik V refutes claims Russia stole Oxford vaccine blueprint This becomes more important as several other vaccines, the Russian company claims, have shown a decline in the efficacy against the deadly Delta variant to less than 50 per cent, five months after the shot. Considering the high efficacy of the Sputnik Light vaccine, the one-shot vaccine can also be sued as a booster shot for several other vaccines, the organisation claimed. BREAKING | RDIF: New data from Gamaleya Center shows 1-shot Sputnik Light vaccine, 1st component of #SputnikV, is 70% effective against the Delta strain 3 months after injection, making it оne of the world’s leading standalone vaccines & and ideal booster for other vaccines. pic.twitter.com/1u6HC0NpXS — Sputnik V (@sputnikvaccine) October 13, 2021 × "As a standalone, Sputnik Light is a great fighter against the Delta variant, based on this data and this is particularly important because in addition to being a standalone vaccine, Sputnik V can also be a booster to other vaccines," Dmitriev said. "Booster is much needed by the world because many other vaccines show decline of efficacy to 68 per cent on month three and Sputnik Light is efficient against 70 per cent against Delta on month three of vaccine. So, mRNA vaccines need booster and Sputnik Light can be a booster to mRNA and other vaccines." WATCH | He also reminded the world that Russia’s Gamaleya Research Institute of Epidemiology and Microbiology was the first in the world to suggest combination of different vaccines. The institute was also the first to start clinical trials with AstraZeneca in February. Currently, the Russian experts are running clinical trials with Argentina of Sputnik Light as a booster shot with Sinopharm, Moderna and more. "Those trials show very nice safety and efficacy results and we believe that if Sputnik Light is used as a booster, it will have efficacy similar to Sputnik V original vaccine, which is 83 per cent against infections and 94 per cent against hospitalisations," Dmitriev claimed. He also said that the experts believe that Sputnik Light is positioned to a 'universal booster'.

'Universal booster': Sputnik Light's efficacy higher than other vaccines, experts claim

Russia's single-dose COVID-19&nbsp;vaccine Sputnik Light will be produced in India, much in the line of its predecessors Sputnik V whose production also happens in the country.

"It will be produced in exactly the same countries where Sputnik V will be produced. So it's India, Korea, and China," said&nbsp;Kirill Dmitriev, CEO of the Russian direct investment Fund (RDIF) in a virtual presser told reporters.&nbsp;

He explained, "many other countries already produce the Sputnik V vaccine. So same capabilities production can be used because basically&nbsp;Sputnik light will be the first shot of the Sputnik V vaccine. So we will use the same production capacity that exists."

The Russian ministry of health, the Gamaleya National Research Center of Epidemiology and Microbiology, and RDIF on Thursday announced that Sputnik light has received authorization for use in Russia.&nbsp;

According to RDIF, the Sputnik Light vaccine demonstrated 79.4 per cent&nbsp;efficacy. 7000 people in multiple countries like Russia, UAE, Ghana, and others were involved in its Phase III clinical study.&nbsp;

India has given approval to Sputnik V and the first consignment arrived in the country on May 1.

In fact, RDIF has signed pacts with five&nbsp;Indian companies to produce 850 million doses of the vaccine in the country that will not only be used in India and Russia but also exported to the third&nbsp;country.&nbsp;

Indian envoy to Russia Bala Venkatesh Varma recently said, "We expect in the months ahead more than 60-70 per cent of Sputnik vaccine produced anywhere will be produced in India".

More than 60 countries have given approval to Sputnik V and as of May 5&nbsp;more than 20 million people globally have received the first injection of the&nbsp;Sputnik V vaccine.

Meanwhile, the cost of the Sputnik Light vaccine globally according to Russian authorities will be less than $10 and it can be kept in temperatures at +2 +8.&nbsp;Kirill Dmitriev is hopeful of various regulators across the world giving it approval, with some approvals expected as early as next week.&nbsp;

Russia's single-dose COVID-19 vaccine Sputnik Light will be produced in India, much in the line of its predecessors Sputnik V whose production also happens in the country.

Russia's single-dose COVID-19 vaccine Sputnik Light will be produced in India, much in the line of its predecessors Sputnik V whose production also happens in the country. "It will be produced in exactly the same countries where Sputnik V will be produced. So it's India, Korea, and China," said Kirill Dmitriev, CEO of the Russian direct investment Fund (RDIF) in a virtual presser told reporters. He explained, "many other countries already produce the Sputnik V vaccine. So same capabilities production can be used because basically Sputnik light will be the first shot of the Sputnik V vaccine. So we will use the same production capacity that exists." The Russian ministry of health, the Gamaleya National Research Center of Epidemiology and Microbiology, and RDIF on Thursday announced that Sputnik light has received authorization for use in Russia. According to RDIF, the Sputnik Light vaccine demonstrated 79.4 per cent efficacy. 7000 people in multiple countries like Russia, UAE, Ghana, and others were involved in its Phase III clinical study. India has given approval to Sputnik V and the first consignment arrived in the country on May 1. In fact, RDIF has signed pacts with five Indian companies to produce 850 million doses of the vaccine in the country that will not only be used in India and Russia but also exported to the third country. Indian envoy to Russia Bala Venkatesh Varma recently said, "We expect in the months ahead more than 60-70 per cent of Sputnik vaccine produced anywhere will be produced in India". More than 60 countries have given approval to Sputnik V and as of May 5 more than 20 million people globally have received the first injection of the Sputnik V vaccine. Meanwhile, the cost of the Sputnik Light vaccine globally according to Russian authorities will be less than $10 and it can be kept in temperatures at +2 +8. Kirill Dmitriev is hopeful of various regulators across the world giving it approval, with some approvals expected as early as next week.

Russia's single-dose COVID-19 vaccine Sputnik Light to be produced in India

Russia has registered Sputnik Light, the single-dose vaccine against COVID-19, which has an efficacy of 79.4 per cent, the Russian Direct Investment Fund (RDIF) said.

"The Russian Ministry of Health, the Gamaleya National Research Center of Epidemiology and Microbiology and the Russian Direct Investment Fund announce that Sputnik Light, a single dose COVID-19 vaccine, has received authorization for use in Russia. The single-dose Sputnik Light vaccine demonstrated 79.4% efficacy according to analyzed data taken from 28 days after the injection was administered. An efficacy level of near 80% is higher than that of many two-dose vaccines," the RDIF said in a statement.

According to the statement, the efficacy of Sputnik Light was calculated based on data obtained from Russians "vaccinated with a single injection, having not received the second one for any reason during the mass vaccination program between December 5, 2020, and April 15, 2021." 
&nbsp;

<div class="videoWrapper trancodeVideo"><iframe allowfullscreen="" autoplay="1" class="includeVideo" frameborder="0" height="350" src="https://www.wionews.com/videos/covid-19-first-lot-of-russian-vaccine-sputnik-v-arrives-in-india-382006/embed" style="width:100%;max-width:560px;" width="560"></iframe></div>

Sputnik Light is the first component (recombinant human adenovirus serotype number 26 (rAd26)) of the Sputnik V coronavirus vaccine, according to the Russian Direct Investment Fund (RDIF), the sovereign wealth fund marketing the vaccine abroad.

"The Sputnik Light vaccine significantly reduces the possibility of severe cases leading to hospitalization, with only one injection needed. The single-dose regimen solves the challenge of immunizing large groups in a shorter time, which is especially important during the acute phase of the spread of coronavirus, achieving herd immunity faster," said Kirill Dmitriev, CEO of RDIF.

Dmitriev said that the Sputnik Light vaccine will be exported to the international partners "to help increase the rate of vaccinations in several countries in the face of the ongoing fight with the pandemic and new strains of coronavirus".&nbsp;

The Sputnik Light vaccine has received authorization for use in Russia, according to the Russian Ministry of Health, the Gamaleya National Research Center of Epidemiology and Microbiology and the RDIF.On February 21, the Gamaleya Center and RDIF launched a global efficacy study of Sputnik Light.&nbsp;

The Phase III clinical study involving 7,000 people was conducted in multiple countries including Russia, the UAE and Ghana. The RDIF said that the Sputnik Light vaccine is based on a well-studied human adenoviral vector platform that has proven to be safe and effective.&nbsp;

As of May 5, more than 20 million people globally have received the first injection of the Sputnik V vaccine, containing the first component.&nbsp;

"The cost of the Sputnik Light vaccine globally will be less than USD10, while it has simple storage requirements, at +2 +8, which provide for easy logistics. The one-shot regimen allows for the vaccination of large groups of the population in a short time, helping to speed up the fight against the pandemic during the acute phase," the statement read.&nbsp;

Alexander Gintsburg, Director of the Gamaleya National Research Center of Epidemiology and Microbiology, said that Sputnik Light offers strong value in initial vaccination and re-vaccination, as well as boosting efficacy when taken in combination with other vaccines"Sputnik Light will help to prevent the spread of coronavirus through the faster immunization of larger population groups, as well as supporting high immunity levels in those who have already been infected previously," Gintsburg said.

(With inputs from agencies)

Russia has registered Sputnik Light, the single-dose vaccine against COVID-19, which has an efficacy of 79.4 per cent, the Russian Direct Investment Fund (RDIF) said.

Russia has registered Sputnik Light, the single-dose vaccine against COVID-19, which has an efficacy of 79.4 per cent, the Russian Direct Investment Fund (RDIF) said. "The Russian Ministry of Health, the Gamaleya National Research Center of Epidemiology and Microbiology and the Russian Direct Investment Fund announce that Sputnik Light, a single dose COVID-19 vaccine, has received authorization for use in Russia. The single-dose Sputnik Light vaccine demonstrated 79.4% efficacy according to analyzed data taken from 28 days after the injection was administered. An efficacy level of near 80% is higher than that of many two-dose vaccines," the RDIF said in a statement. According to the statement, the efficacy of Sputnik Light was calculated based on data obtained from Russians "vaccinated with a single injection, having not received the second one for any reason during the mass vaccination program between December 5, 2020, and April 15, 2021." Sputnik Light is the first component (recombinant human adenovirus serotype number 26 (rAd26)) of the Sputnik V coronavirus vaccine, according to the Russian Direct Investment Fund (RDIF), the sovereign wealth fund marketing the vaccine abroad. "The Sputnik Light vaccine significantly reduces the possibility of severe cases leading to hospitalization, with only one injection needed. The single-dose regimen solves the challenge of immunizing large groups in a shorter time, which is especially important during the acute phase of the spread of coronavirus, achieving herd immunity faster," said Kirill Dmitriev, CEO of RDIF. Dmitriev said that the Sputnik Light vaccine will be exported to the international partners "to help increase the rate of vaccinations in several countries in the face of the ongoing fight with the pandemic and new strains of coronavirus". The Sputnik Light vaccine has received authorization for use in Russia, according to the Russian Ministry of Health, the Gamaleya National Research Center of Epidemiology and Microbiology and the RDIF.On February 21, the Gamaleya Center and RDIF launched a global efficacy study of Sputnik Light. The Phase III clinical study involving 7,000 people was conducted in multiple countries including Russia, the UAE and Ghana. The RDIF said that the Sputnik Light vaccine is based on a well-studied human adenoviral vector platform that has proven to be safe and effective. As of May 5, more than 20 million people globally have received the first injection of the Sputnik V vaccine, containing the first component. "The cost of the Sputnik Light vaccine globally will be less than USD10, while it has simple storage requirements, at +2 +8, which provide for easy logistics. The one-shot regimen allows for the vaccination of large groups of the population in a short time, helping to speed up the fight against the pandemic during the acute phase," the statement read. Alexander Gintsburg, Director of the Gamaleya National Research Center of Epidemiology and Microbiology, said that Sputnik Light offers strong value in initial vaccination and re-vaccination, as well as boosting efficacy when taken in combination with other vaccines"Sputnik Light will help to prevent the spread of coronavirus through the faster immunization of larger population groups, as well as supporting high immunity levels in those who have already been infected previously," Gintsburg said. (With inputs from agencies)

COVID-19: Russia okays single-dose Sputnik Light vaccine, has 79.4% efficacy