Thread by @sailorrooscout

An analysis of an outbreak of the Delta variant in Ontario, Canada during an indoor event shows there was no further transmission to fully vaccinated household members AND there was NO further transmission from breakthrough cases. Vaccination stopped the train of transmission.🧵

Some considerations to keep in mind. This group IS NOT eligible for COVID-19 vaccination and the outbreak occurred during an indoor high-intensity sports event. There were two distinct COVID-19 exposures on different teams with players under the age of 12. The teams did not play

against each other. Overall, 1 in 3 players on each team were infected (see infographic for more details). There was no further transmission to players on other exposed teams, OR to fully vaccinated household members. Transmission did occur from player cases to 2 of 22 household

contacts, both who were not vaccinated (under the age of 12). Investigation/tracing of the the transmission chains leading to the outbreak identified links to various social gatherings including birthday parties and weddings. Most cases in these chains were unvaccinated

individuals eligible for vaccination, that attended events while contagious (see infographic for more details) but a few were fully vaccinated “breakthrough” cases HOWEVER what is important to note is there was NO further transmission from the “breakthrough cases.”

So what does this mean? Vaccination STOPPED the train of transmission. So, let’s talk about that because there is a lot of misinformation circulating recently. “Vaccinated people are just as likely to spread the coronavirus. This misunderstanding, born out of confusing statements

from public-health authorities and misleading media headlines, is a shame. It is resulting in unnecessary fear among vaccinated people, all the while undermining the public’s understanding of the importance-and effectiveness-of getting vaccinated.”

“So let me make one thing clear: Vaccinated people are not as likely to spread the coronavirus as the unvaccinated. Even in the U.S. where more than half of the population is fully vaccinated, the unvaccinated are responsible for the overwhelming majority of transmission.”

“Despite concerns about waning immunity, vaccines provide the best protection against infection. And if someone isn’t infected, they can’t spread the coronavirus. It’s truly that simple. Additionally, for those instances of a vaccinated person getting a breakthrough case, yes,

they can be as infectious as an unvaccinated person. But they are contagious for a shorter period of time when compared with the unvaccinated, and they harbor less infectious virus overall. That’s why getting more people their shots is crucial for controlling the spread of the

coronavirus: Every vaccinated person helps limit the virus’s ability to hide, replicate, and propagate. Among the unvaccinated, the virus travels unhindered on a highway with multiple off-ramps and refueling stations. In the vaccinated, it gets lost in a maze of dead-end streets

and cul-de-sacs. Every so often, it pieces together an escape route, but in most scenarios, it finds itself cut off, and its journey ends. It can go no further. This is borne out by recent data from New York City that show that more than 96 percent of cases are among the

unvaccinated. Only 0.33% of fully vaccinated New Yorkers have been diagnosed with COVID-19. www1.nyc.gov/assets/doh/dow… Everyone knows that the vaccines help protect each individual who gets their shots. But when more people get vaccinated, this helps keep everyone else

(including children and others ineligible for vaccination) safe as well.” You can read all of this and more here: theatlantic.com/ideas/archive/… and find the case study here: peelregion.ca/health-profess…