- Sputnik International, 1920
Omicron COVID Strain
The new COVID variant was initially detected in South Africa and Botswana and sparked major concerns due to its high number of mutations (32). The WHO dubbed the strain Omicron and warned it may prove to be more transmissible and dangerous than other coronavirus variants.

Study Shows Pfizer, AstraZeneca Vaccines Less Effective Against Omicron Strain, WHO Says

© REUTERS / ERIC GAILLARDEmpty vials of the "Comirnaty" Pfizer-BioNTech COVID-19 vaccine are seen at a coronavirus disease (COVID-19) vaccination center in Nice, France, November 23, 2021.
Empty vials of the Comirnaty Pfizer-BioNTech COVID-19 vaccine are seen at a coronavirus disease (COVID-19) vaccination center in Nice, France, November 23, 2021. - Sputnik International, 1920, 18.12.2021
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MOSCOW (Sputnik) - Preliminary results of a non-peer-reviewed study from the United Kingdom indicate reduced effectiveness of the Pfizer and AstraZeneca vaccines against the Omicron coronavirus variant, the World Health Organization (WHO) has said.
"Results from England indicate a significant reduction in vaccine effectiveness against symptomatic disease for Omicron compared to Delta after two vaccine doses of either Pfizer BioNTech-Comirnaty or AstraZeneca-Vaxzevria vaccines. There was, however, higher effectiveness two weeks after a Pfizer BioNTech-Comirnaty booster, which was slightly lower or comparable to that against Delta," the WHO said in the document, adding that the study also shows higher effectiveness of the Pfizer booster two weeks after.
The organization stressed that this is preliminary data and thus should be interpreted with caution.
In its technical brief on enhancing readiness for Omicron, published on Friday, the WHO referenced a preprint by a team of UK medical scientists, titled "Effectiveness of COVID-19 vaccines against the Omicron (B.1.1.529) variant of concern."
In November, the WHO identified the new strain as one of concern, as its high number of mutations possibly makes it more transmissible and dangerous. The WHO has dubbed it Omicron, the 15th letter of the Greek alphabet.
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