It is confirmed that the new Corona Delta strain significantly reduces the effectiveness of the vaccine
Vaccines provided by each company are inoculated all over the world to prevent the spread of the new coronavirus infection (COVID-19). However, outbreaks and spreads of highly infectious Delta strains have also been reported. Vaccination status and infection / mortality survey results, including when this delta strain began to be observed, have been published by the
SARS-CoV-2 vaccine protection and deaths among US veterans during 2021
https://doi.org/10.1126/science.abm0620
The research team conducted a survey of 780,225 veterans registered with the US Veterans Health Administration during the period from February 1, 2021 to October 1, 2021. During this period, WHO designated the Delta strain as a 'VOC (Variant of Concern)' and began calling attention to the spread of the infection.
Studies show that the spread of Delta strains reduces overall vaccine efficacy. By type of vaccine, Johnson & Johnson (J & J) was 86.4% to 13.1%, Moderna was 89.2% to 58.0%, and Pfizer was 86.9% to 43.3%. .. The results were the same regardless of age, gender, or the presence or absence of chronic illness.
It is also reported that the risk of death was highest in unvaccinated people, regardless of age or illness. The efficacy of each vaccine type in terms of mortality risk was 73.0% for J & J, 81.5% for Moderna, and 84.3% for Pfizer for those under 65 years of age from July to October.
In addition to this, 'breakthrough infections' have been reported, which infect people who have completed vaccination. Overall, of the 489,148 people who completed vaccination, a total of 26,114 breakthrough infections occurred.
'The benefits of vaccination, which reduces the risk of infection and mortality, are clearly supported by this study, but the effectiveness of the vaccine against infection is diminished in connection with the emergence of Delta strains,' the research team said. The effectiveness of the vaccine against the disease remains high. ”“ These results indicate that in addition to strengthening vaccination efforts, vaccinated people should also take measures such as wearing masks and ensuring physical distance again. It shows the need. '
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