Reactive Airways Dysfunction Synrome or RADS (also known as Reactive Airway Disease or RAD) is a term proposed by S.M. Brooks and colleagues in 1985 to describe an asthma-like syndrome developing after a single exposure to high levels of an irritating vapor, fume, or smoke. In time, however, it has evolved to be mistakenly used as a synonym for asthma. Current usage of the term in the medical community is to describe an asthma-like syndrome in infants that may later be confirmed to be asthma when they become old enough to participate in diagnostic tests such as the methacholine challenge test. It can also manifest in adults with exposure to high levels of Chlorine gas, creating symptoms like asthma. The severity of these symptoms can be mild to fatal, and can even create long term airway damage depending on the amount of exposure and the concentration of Chlorine. Some experts classify RADS as occupational asthma. Those with exposure to high irritating substances should receive treatment to mitigate harmful effects.