Positive test for Ulocladium and Cladosporium – Are these harmful?

It’s not a simple answer to say it’s safe or not. What type of testing was done to determine the mold types and what were the spore counts? Both mold types could have negative health effects, the severity of the symptoms would most likely be determined by the amount of spores present.

This article on the most dangerous molds might help answer your question, especially on Cladosporium being toxic or harmful.