While many Jewish communities have common aspects of Jewish (social) living that probably helped spread COVID-19 back in March and April, I don't know if there's another community like Crown Heights, where hospitality and thousands of guests and visitors from all over the world are the norms.
During the Feb-Apr period it seems like anywhere between 60% and 80% of the community contracted the virus, and by this point everyone was likely exposed in some way or another to it.
In a regular year, there would be hundreds of Bochurim arriving by now, with a few hundred staying for the year in Yeshiva, and hundreds more coming only for Tishrei. And then you would have a few hundred married people coming for Sukkos. This year is different. We will only be able to say in retrospect how so.
About 150 bochurim arrived since late August with the intent of staying in 770 to learn for anywhere between 3 months to a year. A quarantine in CT was arranged for them, and ostensibly they were all tested for COVID-19 upon conclusion of the quarantine before coming to Crown Heights in recent days.
I just heard that apparently some of those that completed the quarantine have now tested positive for COVID-19 in Crown Heights.
This is a developing story.