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The fourth wave of the pandemic was caused primarily by the Delta Coronavirus variant. The number of infections was very high, even in highly immunized countries like Israel and the United Kingdom. Why is this happening? Scientists talk about two factors.
- Fully vaccinated people are susceptible to COVID-19 infection, but have a much milder progression than unvaccinated people
- None of the current vaccines is 100 percent inhibitory. before getting sick
- This is especially the case with the Delta variant
- More information can be found on the Onet homepage
The vaccinated become infected with the Delta variant
Virologists continue to emphasize that people who are fully vaccinated against COVID-19 are strongly protected against severe disease, hospitalization and death. But they are not 100% protected. before the infection itself, often called “breakthrough” in this case. None of the currently used vaccines offers complete protection in this respect.
The Delta variant is responsible for the current infections, including the “breakthrough” ones, almost all over the world. Unfortunately, we still do not have exact data on how long protection against the coronavirus lasts after full vaccination.
The rest of the text is below the video.
The first signal of “breakthrough” infections came from Israel, the first country in the world to vaccinate citizens on a massive scale. Research conducted in July showed that the effectiveness of the Pfizer vaccine in protecting against SARS-CoV-2 infection is on average 40%. This efficiency was only 16%. in people vaccinated the earliest, in January, but in those vaccinated in April, it was at the level of 79%.
Scientists from Great Britain presented completely different data. Based on studies conducted in April and May, they showed that the effectiveness of Pfizer (after two doses) against the Delta variant is 88 percent.
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This data is difficult to compare. The vaccination programs in both countries are different (Israel only vaccinated with Pfizer, several preparations are used in the UK), and the study groups were also different.
However, both studies were more consistent in assessing the effectiveness of protection against severe COVID-19 and hospitalization. A British survey said 96 percent. effectiveness, Israeli by 88 percent.
Why do the vaccinated get infected?
– No vaccine is 100 percent. effective – says CNBC prof. Lawrence Young, virologist at Warwick Medical School. “There will always be a certain percentage of people susceptible to infection and getting sick,” he adds.
He explains that there are two main factors that affect the effectiveness of a vaccine. – The first is the declining immunity caused by vaccination. We still don’t know how long it lasts. This factor is crucial especially in the elderly and those who were vaccinated the earliest – says Prof. Young. The second element is related to “breakthrough” infections caused by the most infectious Delta variant.
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It is difficult to say how many “breakthrough” infections actually occur. Many cases are mild or asymptomatic and may not be officially recorded. According to data from 38 US states, there were 125. 682 such cases (around 1400 of this group died). The number of vaccinated people is about 165 million, so infections appeared in 0,08 percent. of them. That is one person out of 1300. This is a clearly lower percentage than in the case of the unvaccinated.
How often do they get infected?
«The number of infections and vaccinated people is as expected. And the number of hospitalizations and deaths is very small »- said the US agency Centers for Disease Control and Prevention recently.
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– Vaccines are very effective in protecting against acute infection, hospitalization and death. They don’t provide as much efficacy before infection itself, but those who get vaccinated tend to have mild symptoms in most cases, said Andrew Freedman of UK’s Cardiff Medical School.
A British study recently announced that people who had received two doses of the vaccine had positive coronavirus tests three times less frequently. The vaccinated are also much less likely to transmit the virus to other people.
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.
Also read:
- COVID-19 despite vaccination – who is most at risk? A risk calculator was created
- New rules for declaring deaths. Changes in the regulations are coming
- BioNTech chief: a new COVID-2022 vaccine will be needed in 19
- Biologist: there will be fewer deaths than last year
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