Scientists are still researching the effectiveness of COVID-19 vaccines. According to the latest data from Oxford, they are not as effective as it seemed at the beginning, it is mainly about the duration of their operation. It also found that AstraZeneca offered longer protection against the coronavirus than the Pfizer vaccine.
- A recent study by Oxford researchers shows that over time, the Pfizer vaccine is less effective than AstraZeneca
- This is confirmed by the results of research from Qatar, which additionally show that Moderna was more effective in the case of infection with the Delta variant
- There are many indications that the introduction of an additional dose of the vaccine would be justified, but caution is recommended
- More information can be found on the Onet homepage
Researchers at the University of Oxford released the results of a study last week that showed that after nearly four months, the effectiveness of the Pfizer vaccine had almost halved. Additionally, people infected with the Delta variant had the same high viral load as unvaccinated people. Scientists from the USA and Qatar published similar conclusions. They indicate that additional doses of the vaccine are needed to increase the effectiveness of protection against the virus.
AstraZeneca more effective than Pfizer
Researchers in Oxford have shown that vaccine efficacy has been declining since the Delta strain became the dominant strain in the UK in May. Although the Pfizer vaccine was most effective at first, within four to five months after the second dose, its effectiveness was about the same as that of AstraZeneki – the protection offered by the latter had slightly decreased. Tomas Hanke, professor of vaccine immunology at the Oxford Jenner Institute, even believes that AstraZeneca builds immunity for longer. “An RNA vaccine like the Pfizer vaccine provides a specific number of mRNAs that are eventually removed from the body,” he said.
- The third dose of Pfizer significantly increases immunity. Who should get it?
The collected data show that in the period from February to July protection against coronavirus in the case of a vaccine produced by Moderna, fell from 91 percent. up to 76 percent and with 89 percent up to 42 percent for the Pfizer vaccine. A study in Qatar, on the other hand, focused on the Delta variant, found that two doses of Pfizer were effective in keeping the infection at bay in 60 percentwhile Moderna was effective in 86 percent
Possible to enter a third dose
A Public Health England study in May showed a more optimistic picture: Pfizer’s double vaccination was 88%. effective in preventing infection with the Delta variant. Studies conducted in Canada and Scotland showed that the effectiveness is 87%, respectively. and 79 percent In turn, research in Israel showed that the Pfizer vaccine was only 41 percent. effective in the prevention of symptomatic infections in June and July.
- More and more cases of COVID-19 in children. «It’s a Delta variant»
Research results show that antibody levels decline over time, which would warrant accepting the ideas associated with the administration the third dose of the vaccine. Pfizer has been saying for some time that a third injection would be required, possibly around eight to ten months after the second dose. However, Adam Finn, a member of the UK immunization committee, said there was “no clear evidence” to justify giving a third dose and that such voices were due to the financial benefits it entails.
Do you want to test your COVID-19 immunity after vaccination? Have you been infected and want to check your antibody levels? See the COVID-19 immunity test package, which you will perform at Diagnostics network points.
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