Russian scientists say the country’s Sputnik V vaccine appears safe and effective against the new coronavirus, according to early results of an advanced study published in a British medical journal.

The news is a boost for the shot that is increasingly being purchased by nations around the world who are desperate to stop the devastation caused by the pandemic.

Researchers say, based on their trial that involved about 20,000 people in Russia last fall, the vaccine is about 91 percent effective and appears to prevent people from becoming severely ill with COVID-19. The study was published online Tuesday in the journal The Lancet.

Scientists not linked to the research acknowledged that the speed at which the Russia vaccine was made and rolled out was criticized for “unseemly haste, corner cutting and an absence of transparency.”

“But the outcome reported here is clear,” British scientists Ian Jones and Polly Roy wrote in an accompanying commentary. “Another vaccine can now join the fight to reduce the incidence of coronavirus.”

“This is a great day in the fight against the pandemic,” said Kirill Dmitriev, CEO of the Russian Direct Investment Fund that bankrolled the development of the shot.

The Sputnik V vaccine was approved by the Russian government with much fanfare on August 11. President Vladimir Putin personally broke the news on national television and said one of his daughters had already been vaccinated with it. At the time, the vaccine had only been tested in several dozen people.

Some early results on it were published in September, but participants had only been followed for 42 days and there was no comparison group.

The latest study is based on research involving about 20,000 people over 18 at 25 hospitals in Moscow between September and November, of whom three-quarters got two doses of the Russian vaccine 21 days apart and the remainder got placebo shots.

The most commonly reported side effects were flu-like symptoms, pain at the injection site and fatigue. Serious side effects were rare in both groups and four deaths were reported, although none were considered to be the result of the vaccine.

The study included more than 2,100 people over 60 and the vaccine appeared to be about 92 percent effective in them. The research is ongoing but in December, Russia’s Health Ministry said it was cutting the size of the study from the planned 40,000 subjects to about 31,000 volunteers who have already enrolled. Developers of the vaccine cited ethical concerns about using placebo shots.

The Russian vaccine uses a modified version of the common cold-causing adenovirus to carry genes for the spike protein in the coronavirus as a way to prime the body to react if the coronavirus comes along. That’s a similar technology to the vaccine developed by AstraZeneca and Oxford University. But unlike AstraZeneca’s two-dose vaccine, the Russians used a slightly different adenovirus for the second booster shot.

Some experts say that approach may explain why the Russian vaccine seems to have produced a better immune response than the AstraZeneca vaccine, which has a reported efficacy rate of about 60 to 70 percent.

“This aims to drive higher immune responses to the target ‘spike’ by using two slightly different jabs,” said Alexander Edwards, an associate professor in biomedical technology at Britain’s University of Reading, who was not connected to the Russian research.

He said if you have two identical shots, it’s possible the immune system doesn’t get as big a boost from the second injection.

Sputnik V was rolled out in a large-scale vaccination campaign in Russia in December, with doctors and teachers the first in line. Last month, Putin ordered mass immunizations to start.

In early January, the Russian Direct Investment Fund said over 1 million Russians had already been vaccinated with it. Some Russian media questioned the number, suggesting that the rollout has been much slower, with many Russian regions reporting small numbers of vaccinations.

Outside Russia, Sputnik V has received authorization in over a dozen countries, according to the fund — including the former Soviet republics of Belarus, Armenia and Turkmenistan; Latin American nations including Argentina, Bolivia and Venezuela; African nations such as Algeria as well as Serbia, Iran, Palestine and UAE.

Batches of the vaccine have already been supplied to six countries. In all, more than 50 countries have submitted applications for 2.4 billion doses, an RDIF spokesman told The Associated Press.

Algeria will begin producing the Sputnik V vaccine “within the coming weeks,” Kamel Mansouri, the head of Algeria’s national agency for pharmaceuticals, said Tuesday. The first batch of 50,000 doses arrived in Algeria last week.

The European Medicines Agency said the developers of Sputnik V recently asked for advice on what data they needed to submit for the agency’s experts to consider recommending that the vaccine be licensed across the 27-nation European Union.

Hungary’s first shipment of Sputnik V — 40,000 doses — arrived on Tuesday, Foreign Minister Peter Szijjarto said on Facebook. Hungary expects to get enough Sputnik V vaccine to treat 1 million people in the next three months.

Hungarian health authorities were the first in the EU to approve the vaccine on Jan. 21, but the National Public Health Center must still give its final approval before shots are distributed to the public.

The minister took the opportunity to blast the EU’s own vaccination rollout, which has been much slower than ones in Israel, Britain or the United States.

“Brussels’ centralized vaccine procurement has been a failure, which has risked the lives of Europeans and the swiftest restarting of the European economy,” Szijjarto said.

“We were the first, but we probably won’t be the only ones” in the EU to consider using Russian and Chinese vaccines, he added.-AP

A healthcare worker prepares a dose of Russia's Sputnik V coronavirus vaccine, at the Del Norte Hospital in El Alto, Bolivia, Saturday, January 30, 2021.

Sputnik V coronavirus vaccine appears safe and 91pc effective, Russian scientists say