Development of multiple chemical sensitivity after an outbreak of sick-building syndrome.
Welch, L S, Sokas, R·Toxicology and industrial health·1992
When workers were exposed to problems in a building (sick-building syndrome), some developed multiple chemical sensitivity (MCS)—a condition where people react to low levels of chemicals. This study looked at 20 people affected by the outbreak and found that most had existing health conditions like allergies or asthma that got worse. Importantly, having ME/CFS did not predict who would develop MCS, and many people had ongoing problems beyond just MCS after leaving the building.