2scents,
also anecdotally, in my community that has people coming from very different backgrounds, all clusters that I heard of came after people came from visiting those “normal” communities and then immediately going to shul or sending kids to school. In some cases, clusters grew somewhat due to some local individuals not staying in quarantine, but otherwise were stopped by adherence to quarantine and school closing protocols. Again, this is anecdotal, but no less solid that your statement that many communities were not affected.
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