B.On the basis of a new study, ritical researchers recommend maintaining corona rules even with high vaccination rates. “Ongoing measures to contain the spread such as wearing masks, keeping your distance and testing remain important, even for vaccinated people,” wrote Anika Singanayagam of Imperial College, co-author of a study published Thursday in the journal Lancet Infectious Diseases London.
For the study, the British researchers analyzed the disease data of 621 people who became infected with corona between September 2020 and September 2021 and showed mild or no symptoms. Using daily PCR tests, the researchers were able to analyze how long the participants had been infectious and how high their viral load was. It came out: Even fully vaccinated people still have a certain risk of contracting the Delta variant and infecting other members of their household. At times, their viral load was similar to that of the unvaccinated.
According to the authors of the study, the results provide an explanation for why the globally prevalent, highly contagious Delta variant can also cause high numbers of infections in countries with high vaccination rates such as Great Britain. “Our results show that vaccinations alone are not enough to protect people from contracting the Delta variant and spreading it in their homes,” wrote one of the lead authors, Ajit Lalvani of Imperial College London.
Decreasing immunity of vaccinated persons
It has also been shown that the immunity of vaccinated people decreases after a few months. The researchers urgently recommended unvaccinated people to be vaccinated against Covid-19 and those already vaccinated to accept offers for booster vaccinations.
As a weakness of their study, the researchers admitted that the initial cases were people with Covid-19 symptoms, who were therefore identified by the British test system. It cannot be ruled out that previously undetected, asymptomatic infections may have occurred in their households.
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