In the early part of the 1900s, a woman named Mary Mallon worked in the New York City area for several families. She appeared healthy, yet she was a carrier of a deadly disease and the cause of several serious outbreaks.

Several operating rooms have been shut down in a Washington children's hospital because of mold.

In the United States, one in 10 children suffers from asthma but the potential environmental factors contributing to the disease are not well known. Cincinnati-based researchers now report new evidence that exposure to three types of mold during infancy may have a direct link to asthma development during childhood, according to ScienceDaily.