They did not read the first two sentences of the story?

The School District of the City of Monessen has provided an update on what was once believed to be a confirmed case of chickenpox.

According to a second letter sent out by the district, what was originally believed to be a case of chickenpox at the Monessen Elementary Center has turned out to be a viral rash, and chickenpox has been ruled out. 

Suspected chickenpox case at Monessen Elementary Center found to be viral rash – CBS Pittsburgh