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An article published by the journal Nature on 6 July 2021 cited data released by the United Arab Emirates on some 81,000 individuals who had received Sputnik V, according to which the vaccine demonstrated an efficacy of 97.8% in preventing symptomatic COVID-19, and 100% efficacy in preventing severe complications.
Moderna has launched a trial of a vaccine to tackle the Beta variant or lineage B.1.351. [460] On 17 February 2021, Pfizer announced neutralization activity was reduced by two-thirds for this variant, while stating that no claims about the efficacy of the vaccine in preventing illness for this variant could yet be made. [461]
Pfizer and Moderna vaccines are both safe and have similar effectiveness at preventing COVID-19 illness. Clinical trial data when they were first released in December 2020 showed 95% efficacy for ...
Russia was quick to develop its two-dose Sputnik V vaccine last year and has also deployed a one-shot Sputnik Light vaccine, both of which have it says demonstrated high efficacy in trials, but ...
On 29 June 2021, the director of the Gamaleya Institute, Denis Logunov, said that Sputnik V is about 90% effective against the Delta variant. [81] On July 21, researchers from PHE published a study finding that the Pfizer vaccine was 93.7% effective against symptomatic disease from Delta after 2 doses, while the Astrazeneca vaccine was 67% ...
Vaccines from AstraZeneca , Russia's Gamaleya Institute and Johnson & Johnson fight the coronavirus with another virus, leaving scientists concerned the shots may lose potency if annual ...
Vaccine Initial effectiveness by severity of COVID-19 Study location Refs Asymptomatic Symptomatic Hospitalization Death Oxford–AstraZeneca
Retrospective cohort study of the effectiveness of two Russian vaccines against the SARS-CoV-2 Delta variant in Moscow (June–July 2021) proved that EpiVacCorona, unlike Sputnik V, is an ineffective vaccine and therefore cannot protect against COVID-19. [4]
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