I don’t assume an unvaccinated person is infected nor do I assume that a vaccinated one isn’t and prior infection can also provide some immunity for both groups which complicates things further.
But the relative odds skew heavily one way
The new CDC study also found that unvaccinated people were nearly five times more likely to be infected with Covid than vaccinated people.
www.cnbc.com
Relative risk means we compare the risks for COVID-19 infection, hospitalization, and death in unvaccinated people relative to vaccinated people. The boxes in the dashboard’s top line show the relative risk of infection (positive test), hospitalization, and death for unvaccinated people, compared with those who are fully vaccinated. For example, in the month leading up to August 26, unvaccinated people in King County were:
- 7 times more likely to test positive for COVID-19 than vaccinated people
- 49 times more likely to be hospitalized than vaccinated people
- 32 times more likely to die from COVID-19 than vaccinated people.
We look at relative risk because the number of people who are vaccinated is not the same as the number who are not fully vaccinated. The two groups are not the same size, so a raw count or percentage of breakthrough cases doesn’t tell us much about how one group’s risk compares with the other. By comparing the
rates among vaccinated people with the
rates among unvaccinated people, we see that the risks from COVID-19 are far higher if you are not fully vaccinated.
Plus if you are vaccinated even if you are infected you are less likely to transmit it
British scientists examined how the Pfizer-BioNTech and the AstraZeneca vaccines affected the spread of the virus if a person had a breakthrough infection.
www.nbcnews.com
People who are
vaccinated against Covid-19 are less likely to spread the virus even if they become infected, a new study finds, adding to a growing body of evidence that vaccines can reduce transmission of the delta variant.
British scientists at the University of Oxford examined national records of nearly 150,000 contacts that were traced from roughly 100,000 initial cases. The samples included people who were fully or partially vaccinated with either the
Pfizer-BioNTech or the AstraZeneca vaccines, as well as people who were unvaccinated. The researchers then looked at how the vaccines affected the spread of the virus if a person had a breakthrough infection with either the alpha variant or the
highly contagious delta variant.
Both vaccines reduced transmission, although they were more effective against the alpha variant compared to the delta variant. When infected with the delta variant, a given contact was 65 percent less likely to test positive if the person from whom the exposure occurred was fully vaccinated with two doses of the Pfizer vaccine. With AstraZeneca, a given contact was 36 percent less likely to test positive if the person from whom the exposure occurred was fully vaccinated.
