Our expert says:
Coxachie virus infections are contagious and spread by droplets and hand contact. The teacher should preferably not have teached especially if she had blisters as the fluid in the blisters contain high levels of the virus. See http://www.kidshealth.org/parent/infections/bacterial_viral/coxsackie.html
I think the school is misinformed - maybe you should print this article and give it to the headmistress?
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