The developer of Russia’s flagship vaccine against Covid-19 said it shows a 92% efficacy rate in preventing cases of the illness, as the country pushes for a top slot in the fight against the coronavirus after a rival product by Pfizer Inc. reported a similar breakthrough.
The preliminary Phase 3 findings are based on results from 20,000 volunteers who were given the first dose, including more than 16,000 who also received a second injection, its developers Gamaleya Research Institute of Epidemiology and Microbiology and the Russian Direct Investment Fund said in an announcement on Twitter Wednesday.
Russia, which said it was the first in the world to do so when it registered Sputnik V in August, has faced skepticism from scientists and pharmaceutical companies, who say that more testing is necessary to prove the inoculation is safe and effective.
“The Russian vaccine has been vilified so much, it’s developed immunity itself to criticism,” RDIF head Kirill Dmitriev said in a phone interview.
The latest data is based on results 21 days after the initial injection and will be published in a peer-reviewed medical journal, according to the statement. The 92% efficacy rate was based on 20 confirmed Covid-19 cases split across vaccinated subjects who got two doses and those who got the placebo. No unexpected adverse events have been reported in the trial and monitoring is continuing, the backers said. The trial is to include a total of 40,000 subjects, but not all have yet been vaccinated.
“The percentage of the infected can change significantly after they inoculate more volunteers and the trial goes into the final phase,” said Ilya Yasny, head of scientific research in Inbio Ventures, a biotech venture capital fund with a Moscow-based scientific team.
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“The timing suggests it was motivated in part in response to Pfizer,” said Jeremy Rossman, a senior lecturer in virology at the University of Kent in the U.K. “This seems more about public relations than reporting medical data on the Phase 3 trial.”
The RDIF didn’t immediately respond to a request for comment on the timing of Wednesday’s announcement.
The Sputnik V shots have also been given to more than 10,000 health workers, teachers and officials outside the trial.Preliminary observations from this group show effectiveness over 90%, the Health Ministry said hours after Pfizer’s announcement this week.
“The bottom line is that until we see a peer-reviewed article, we must view the claims with skepticism,” said Arthur Caplan, director of medical ethics at NYU School of Medicine, of the latest announcement.
Pfizer’s vaccine candidate, developed with BioNTech SE, is at least 90% effective, according to aninterim analysis published this week in what was hailed as the most encouraging scientific evidence supporting an inoculation to date.
In comparison to the Sputnik V trial, Pfizer enrolled almost 44,000 people in its study and dropped the initially planned 32-case interim analysis in favor of a minimum of 62 Covid-19 cases, eventually publishing the report when the case count reached 94.
“Although based on fewer cases than the recent Pfizer data, the vaccine looks as efficient,” said Ian Jones, professor of virology at the University of Reading in the U.K. “We still need to know about the longevity of the response and the efficiency in different age groups, but the result bodes well for the other trials currently in progress.”
With the world’s fifth-largest number of Covid-19 cases, Russia is also hoping to capture a share of the global market for a tool to control the pandemic that has killed more than 1.2 million people across the planet. Domestic output aims to reach over 70 million a year by April 2021, according to Deputy Prime Minister Tatyana Golikova. Russia also plans to manufacture more than 500 million doses of the Sputnik V vaccine per year in other countries through local production including in India, South Korea, Brazil and China.
Still, since it was approved for use, Sputnik V has faced challengesramping up production as other inoculations globally prepare for widespread roll-out.
— With assistance by Ilya Arkhipov
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