Remediation is necessary even in the absence of health complaints and illness.
Additionally, its important to remember that you are most likely being exposed to several different types of fungi, if your environment is in deed moldy. Rarely, if ever, will there only be one species of fungi present. Finding Aspergillus versicolor in a bulk sample gives you no information on whether or not you have inhaled the fungi. Without additional information on the sampling method, one cannot make conlusions about your exposure. Whether or not a particular fungus produces mycotoxins in a given situation appears to depend on the environmental conditions at the time, including the growth substrate, temperature, and pH. Simply finding A. versicolor does not mean that you have been exposed to hazardous levels of mycotoxins or that mycotoxins were ever produced by that particular fungus.