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Qatari doctors spoke about the effectiveness of foreign vaccines

17.08.2021 45 просмотров

Moderna's vaccine has prevented up to 85% of Delta coronavirus infections in Qatar.


Doctors followed the spread of the SARS-CoV-2 delta variant in Qatar and concluded that Pfizer and Moderna's RNA vaccines prevented about 53% and 85% of infections with this coronavirus variant, respectively. 


"Our observations show that the effectiveness of the Pfizer vaccine in combating the spread of the delta strain of coronavirus was about 53%, while the effectiveness of the Moderna vaccine is close to 85%. Both drugs reduced by 90-99.9% the number severe cases and deaths from COVID-19,” the researchers write.


The emergence and spread of new variations of the coronavirus has created a lot of concern among doctors and epidemiologists about whether existing vaccines will be able to resist these strains of SARS-CoV-2. The first experiments showed that most vaccines remained highly effective, but the level of protection they provided decreased slightly.


A team of Qatari and American health professionals, led by Leis Abu-Raddad, an associate professor at Cornell University in Qatar, received the first assessments of how effectively vaccines from Pfizer and Moderna cope with delta strain of coronavirus that emerged in India in late autumn last year.


More than 73% of Qatari residents received two doses of either Pfizer or Moderna between January and August of this year, according to the researchers. This gave scientists a unique opportunity to assess how herd immunity to SARS-CoV-2 would counteract the spread of the most infectious variant of the coronavirus so far.


Observations of the spread of the delta strain of coronavirus showed that both vaccines prevented a large number of infections, but their effectiveness was quite different. Scientists estimate that the Pfizer vaccine failed to prevent about 300 cases of infection with the “Indian” version of SARS-CoV-2, while the Moderna vaccine failed to protect just over 50 people from infection.


According to the researchers' calculations, this means that the first vaccine has approximately 53% effectiveness against the delta strain of coronavirus, while for the second this figure is 85%. At the same time, both drugs have reduced the number of hospitalizations and deaths from severe forms of COVID-19 to virtually zero.


"The delta variant of the coronavirus entered Qatar in March of this year, but by August it had not caused any major outbreaks of the infection. Our observations showed that this was potentially due to the high level of vaccination of the country's population with vaccinations from Pfizer and Moderna," the scientists summed up.

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