The tests carried out in the UK showed that the Astrazeneca and Pfizer vaccines prevented about 67% and 80% of cases of infection with a new type coronavirus. Results of research Scientists have been published on MedRxiv.
“Our observations show that the Vaccines are Astrazeneca and Pfizer noticeably reduce the likelihood of further distribution of the coronavirus delta strain. At the same time, we found that in the first months after vaccination, the Pfizer vaccination is much more efficient than the drug from Astrazeneca, but this advantage quickly disappears with time.” , – Researchers write.
Initially, as scientists noted, both vaccinations have similar, very high level of efficiency – 80% for the Astrazeneca vaccine and 90% for the drug of Pfizer. Their use not only significantly reduced the number of infections by the British Coronavirus, but also reduced the share of severe cases of COVID-19.
The situation was changed in May of this year, when the delta version of Coronavirus began in Britain. The effectiveness of the Astrazeneca vaccine fell to a mark of 67%, whereas in the case of PFizer this figure was 80%. According to scientists, this reduction in particular touched upon the elderly British and those people who were previously infected with coronavirus.