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Marin Co. Elementary School incident
#1
Here's the publication at the CDC on the Marin County (CA) elementary school incident.

"Outbreak Associated with SARS-CoV-2 B.1.617.2 (Delta) Variant in an Elementary School — Marin County, California, May–June 2021"

What I missed in the headlines:
  1.  This was near the end of the last school year (May 2021).  The variant wasn't yet named "Delta".  It was 1% of US cases at the start of May, and 7% at the start of June.
  2.  The CDC reports (in their poster) "12 of 24 kids infected"  while the paper shows that only 22 were tested, so it SHOULD say 12 of 22 kids infected, with 2 unaccounted for.
  3.  All 5 in the front row were positive.  3 of the 4 tested in the 2nd row were positive.  Then 1 of 5, 1 of 4, 2 of 4.
  4.  Another classroom nearby 3 grades higher had simultaneous cases.  6 of the 14 tested were positive.
       Several of the infections had identical genomes to those of the teacher.
  5.  Siblings of students in the index class (in other grades) later showed up with cases.
  6.  There were 5 other identical genomes in the community, including one from May 18, but an epidemiological link couldn't be established.
  7.  There was plenty of ventilation and an air filter in the classroom.
  8.  Desks were separated by 6' in two dimensions.

The teacher had attended "social events" May 13-16 (Thu. - Sun).  The teacher taught the class prior to and during the week of May 17 (Monday) to May 21 (Friday).  Symptoms happened on Wednesday May 19.  Test was taken on Friday, with results on Monday.   Student symptoms (both classrooms) started on Saturday May 22.

Apparently, the reading without a mask happened multiple times (date(s) not given).
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Marin Co. Elementary School incident - by M_T - 08-28-2021, 11:51 PM

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