musicaljoke
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So, the risk went from about .015% to about 0.06? That makes sense, since the overall rate of breakthrough varies (according to vaccine and other variables) from .037-.05 in studies not trying to look at the Delta variant.
6 in 10,000 then. I do want to know how long after vaccination these breakthroughs are occurring because I'm helping with a local study where we're definitely finding that people who treated their first shot as pretty much complete immunity are among the breakthrough cases, and those with a second shot who nevertheless began to take up high risk activities within 2 weeks after vaccination are a big segment of the breakthrough cases.
There needs to be more work - but the CDC should probably start doing more to warn people that they ought not to go hang out all night at an enclosed bar with loud people on the very day they got their vaccine (people actually go celebrate their vaccine in this manner - or wait a week and go to a house party or stop wearing masks indoors). We've still got indoor mask mandates where I live - so our breakthrough rates are lower, thankfully.
Ontario is keeping track and reporting daily covid case numbers in vaccinated, partially, and unvaccinated people. Ontario has a fully vaccinated rate of 67%, and 83% of the eligible population has had at least one dose.
Of the 746 cases today with a known vaccination status:
499, or 66.9 per cent, were in unvaccinated people.
68, or 9.1 per cent, had a single dose.
179, or 24 per cent, had two doses.
So we can see that 76% of the cases are in people who are not vaccinated or partially vaccinated.
The province's raw data on the vaccination status of cases does not include breakdowns by age.
That, and the fact that the populations of vaccinated and unvaccinated people in Ontario differ greatly by both size and demographics, are important caveats to note when examining cases by vaccination status.
https://www.cbc.ca/news/canada/toronto/covid-19-ontario-september-3-2021-update-1.6163713
COVID-19 vaccine tracker: tracing every dose of the coronavirus vaccine administered in Canada