"The index patient became symptomatic on May 19 with nasal congestion and fatigue. This teacher reported attending social events during May 13–16 but did not report any known COVID-19 exposures and attributed symptoms to allergies. The teacher continued working during May 17–21, subsequently experiencing cough, subjective fever, and headache."
The report also says:
"The school required teachers and students to mask while indoors; interviews with parents of infected students suggested that students’ adherence to masking and distancing guidelines in line with CDC recommendations (3) was high in class. However, the teacher was reportedly unmasked on occasions when reading aloud in class."
So even limited unmasked occasions, with the kids fully masked, is enough to spread COVID-19. Other CDC research indicates that even vaccinated people can be infected with COVID-19 and spread the virus without even having symptoms.
Masking the kids did nothing in this case to stop the spread of COVID-19, just as expected from the science of aerosol virus dispersion.
The teacher must have missed all the lockdowns, masking and other bullsqueezins that was going on for a year and a half prior to this.
I swear to God - many people are too stupid to live.
If you're coughing, stay the eff home, moron.
I'm militantly anti-vaxx - but this kind of stuff is just flat-out mouth-breathing stupid.