“Building materials, such as wood, drywall, paint, and carpet contain organic material that mold can use for food. Mold then requires an adequate source of moisture to grow and survive. This can be obtained from high indoor humidity, pooled water or soaked building material from an external leak, leaking pipe or flood or other water accumulations such as condensation.
Not all mold is considered harmful. However, all mold can potentially cause allergic reactions and other respiratory conditions to those who are sensitive. The severity of the reaction depends on the type of person who is being exposed, the types and levels (concentrations) of mold they are exposed to, and the amount of time they are being exposed to them. While longer periods of exposure to those who are sensitive can result in worsened symptoms, more often symptoms start when exposure has begun.”
Read the rest of the article here: http://www.indoorrestore.com/resources/articles/2011/03/18/how-dangerous-is-household-mold/