How worried should we be about new, more contagious viral variants that seem to evade the immune protection provided by vaccines, Helsingin sanomat asked in the story.
A recent setback was that a vaccine from the University of Oxford and the pharmaceutical company Astra Zeneca, according to an as yet unpublished study, was barely able to prevent mild to moderate cases of the disease caused by the South African variant of the coronavirus.
“It’s disappointing, of course. I still can’t believe that the vaccine would not have any protective effect, ”says Rämet.
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It may well be that the vaccine can protect against severe cases of the disease caused by the variant. The study simply could not demonstrate this because it included only young age groups with severe forms of the disease are rare.
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According to Rämet, due to new virus variants, it is especially important to monitor, as vaccinations progress, whether certain types of viruses can cause disease in vaccinated people and which vaccines can protect against different variants.
Although the Astra Zeneca vaccine performed poorly against the South African variant in younger adults, other vaccines tested in South Africa have held up.
The coronary vaccines of Johnson & Johnson and Novavax provided less protection against the South African variant, but still had the same efficacy as the typical influenza vaccine.
The Johnson & Johnson vaccine prevented symptomatic disease in South Africa by 57% and the Novavax vaccine by 60%. Seasonal flu vaccines provide about 60 percent protection against seasonal flu.
Vaccines from Moderna, Pfizer and Biontech have not been tested in South Africa, but laboratory tests have shown that the antibodies they raise are also less effective against the South African virus variant than other forms of the virus. Still, experts have estimated that vaccines are likely to be able to combat the transformation because they produce so many antibodies.
Vaccine manufacturers have also begun to develop their vaccines to better control new variants of the coronavirus.
The marshes are confident.
“No need to start throwing ashes on. Yes, the pace of virus transformation will be maintained. But you have to be careful about them. ”
Source: Tiede by www.tiede.fi.
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