The actual science of how mold grows, spreads and affects our plants is quite a complex subject. If you want to read more, here is a complex paper about it.
Mold isn't just an aesthetics issue. It is a real health hazard which can cause chronic conditions and many forms of malady. Read about it on a site called Poision.org … just so you realize this is serious!
Viruses and bacteria are a common cause of infectious disease acquired indoors, since they can be easily transmitted, especially in crowded, poorly ventilated environments. Viral transmission routes are diverse, and include direct contact with infected persons, indirect contact with contaminated