The latest public health research report released in the UK shows that the two most widely used new crown vaccines in the UK, Pfizer vaccine and AstraZeneca vaccine, are significantly weaker than the original strain against the rapidly spreading new coronavirus delta strain.
Researchers believe that this may mean that it has become more difficult to achieve the goal of "herd immunity" through vaccination
Public health experts remind the public that because the Delta strain is more transmissible, even if the entire vaccination process is completed, it is still necessary to cooperate with the implementation of epidemic prevention measures such as wearing masks in public places
Reuters reported on the 19th that the study was led by the University of Oxford in the United Kingdom and completed in collaboration with the National Bureau of Statistics and the Department of Health and Social Care.
The researchers analyzed more than 3 million nasopharyngeal swab samples collected from all over the UK, compared the sample data before and after the delta strain in the UK in mid-May this year, and found that the second dose of Pfizer or AstraZeneca vaccine was administered After 90 days, its protective efficacy dropped to 75% and 61%, respectively; in comparison, two weeks after the second dose of vaccination, the efficacy of the two was 85% and 68%, respectively
Sarah Walker, the lead investigator of the study and professor of medical statistics at the University of Oxford, still affirms the effectiveness of the entire vaccination against the delta strain
However, the researchers emphasized that the delta strain is significantly more infectious
Reuters reported that the findings of the Oxford University study were similar to the conclusions of a previous analysis by the US Centers for Disease Control and Prevention
Pfizer previously announced that studies have shown that the protective efficacy of its vaccines diminishes over time
Who co-authored the study, researchers at Oxford University, said Cohen PSC Wales, found out about viral load to remind you, "to achieve a real sense of herd immunity may become more challenging"
He said: "Vaccines are likely to have the best effect in preventing (developing) serious diseases, but are slightly weaker in preventing (virus) transmission
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