There is no way of telling what kind of mold may be present without doing mold samples and lab testing. There are only a few types of mold that are extremely dangerous to humans, but most molds have some type of health effects. Active mold continuously release micotoxins into the air. These micotoxins are like poison to you and me and effect each person differently. Usually the most common result would be an allergic or sinus type of complication. The more deadly molds would most likely effect your central nervous system and even possible death. Anything over 10 SF of mold would require a containment set up for the mold removal process.