Started the outbreak? Hardly. She caught it from someone else. Then spread it to others, presumably to jabbed and unjabbed alike, who probably spread it to others still. You know, sort of like every communicable disease.
All to say: Headline is propaganda to cajole more people into getting jabbed.
Story does not mention if the teacher previously had COVID an had auto immunity
And almost as many kids in another grade tested positive for the China virus.