According to an internal announcement by the Centers for Disease Control and Prevention (CDC), the coronavirus delta variant is as contagious as chickenpox and can cause more serious illness than previous variants.
Vaccines continue to be very effective in preventing particularly serious illness and death, but may be less effective in preventing delta mutant infections and infections. According to the CDC slide deck First acquired Washington post..
The slides are shared within the CDC and cite some of the published and unpublished data that prompted recent changes in the CDC’s masking recommendations. “Acknowledge that the war has changed,” the CDC wrote in the report.
One important point from the slide is that at current levels of vaccination in the United States, the delta continues to expand exponentially, even without other mitigation measures such as masking vaccinated people. That is. According to the presentation, “Universal masking is essential to reduce delta mutant infections given higher infection rates and current vaccination rates.”
On Tuesday (July 27), the CDC updated the mask guidance stating that fully vaccinated people need to resume wearing masks in public indoor spaces in areas high in coronavirus infection. I did. Live science previously reported.. According to the slide, the delta variant is “different from previous strains”. According to the summary slide, it is “highly contagious,” “more likely to be more severe,” and “breakthrough infections can be as contagious as unvaccinated.”
According to the report, there are currently about 35,000 symptomatic breakthrough infections (with arbitrary mutations) per week among 162 million vaccinated Americans. Currently, the risk of symptomatic illness is reduced by a factor of 8 and the risk of hospitalization and death is reduced by a factor of 25 between fully vaccinated and unvaccinated people. Country estimates suggest.
However, according to the slide, the risk of infection with the delta mutant may be reduced by only one-third in vaccinated people.
Delta variants are more infectious than the viruses that cause Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS), Ebola, common cold, seasonal influenza, 1918 influenza and smallpox. It is as infectious as chicken pox. According to the slide.
In addition, according to the slide, people infected with the delta variant have a higher viral load (even if it is groundbreaking) and may release the virus than those infected with other variants. According to a small preliminary study, people infected with Delta can carry 1,000 times more virus particles and test positive than those infected with the original virus two days earlier. Live science previously reported..
More preliminary data from the outbreak of Delta in Bernstable County, Massachusetts, showed no difference in virus levels between those who were vaccinated but had breakthrough cases and those who were not. It suggests that vaccinated breakthrough cases can be infected with delta variants as easily as unvaccinated. (In contrast, previous variants could not easily spread from people vaccinated against breakthrough infections, According to the New York Times).
But that is All those virus particles are infectious, And whether the rate of potential transmission to others is the same for vaccinated and unvaccinated people..
According to data released from Canada, Singapore and Scotland, the CDC slide states that “delta mutants can cause more serious disease than alpha and ancestral strains.”
According to data from England, Scotland, Canada and Israel, the Pfizer-BioNTech vaccine is 93% to 100% effective in preventing hospitalization and death, while 64% to 88% in preventing symptomatic disease caused by delta mutations. Has the effect of.
In addition, according to the slide, breakthrough cases occur more often in aggregate settings and in less effective groups of vaccines, such as immunocompromised people and the elderly. According to the presentation, the risk of hospitalization and death is higher in the elderly compared to the younger population, regardless of vaccination status.
Originally published in Live Science.
“War has changed,” the internal CDC presentation said for the new Delta variant.
Source link “War has changed,” the internal CDC presentation said for the new Delta variant.