Hysterical contagion
Encyclopedia
Hysterical contagion occurs when a group of people show signs of a physical problem or illness, when in reality there are psychological and social forces at work.

Hysterical contagion is a strong form of social contagion, which describes the copycat effect of imitative behaviour based on the power of suggestion and word of mouth influence, because the symptoms often include those associated with clinical hysteria
Hysteria
Hysteria, in its colloquial use, describes unmanageable emotional excesses. People who are "hysterical" often lose self-control due to an overwhelming fear that may be caused by multiple events in one's past that involved some sort of severe conflict; the fear can be centered on a body part, or,...

.

June bug epidemic

The June bug epidemic serves as a classic example of hysterical contagion. In 1962 a mysterious disease broke out in a dressmaking department of a US textile factory. The symptoms included numbness, nausea
Nausea
Nausea , is a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. It often, but not always, precedes vomiting...

, dizziness
Dizziness
Dizziness refers to an impairment in spatial perception and stability. The term is somewhat imprecise. It can be used to mean vertigo, presyncope, disequilibrium, or a non-specific feeling such as giddiness or foolishness....

, and vomiting
Vomiting
Vomiting is the forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose...

. Word of a bug in the factory that would bite its victims and develop the above symptoms quickly spread.

Soon sixty two employees developed this mysterious illness, some of whom were hospitalized. The news media reported on the case. After research by company physicians and experts from the US Public Health Service
United States Public Health Service
The Public Health Service Act of 1944 structured the United States Public Health Service as the primary division of the Department of Health, Education and Welfare , which later became the United States Department of Health and Human Services. The PHS comprises all Agency Divisions of Health and...

 Communicable Disease Center, it was concluded that the case was one of mass hysteria
Collective hysteria
Mass hysteria—other names include collective hysteria, group hysteria, or collective obsessional behavior—is the manifestation of the same or similar hysterical symptoms by more than one person. A common manifestation of mass hysteria occurs when a group of people believe they are suffering from a...

.

While the researchers believed some workers were bitten by the bug, anxiety
Anxiety
Anxiety is a psychological and physiological state characterized by somatic, emotional, cognitive, and behavioral components. The root meaning of the word anxiety is 'to vex or trouble'; in either presence or absence of psychological stress, anxiety can create feelings of fear, worry, uneasiness,...

 was likely the cause of the symptoms. No evidence was ever found for a bug which could cause the above flu-like symptoms, nor did all workers demonstrate bites.

Workers concluded that the environment was quite stressful; the plant had recently opened, was quite busy and organization was poor. Further, most of the victims reported high levels of stress
Stress (medicine)
Stress is a term in psychology and biology, borrowed from physics and engineering and first used in the biological context in the 1930s, which has in more recent decades become commonly used in popular parlance...

in their lives. Social forces seemed at work too.

Of the 62 employees that reported symptoms, 59 worked on the first shift, 58 worked in the same area, and 50 of the 62 cases occurred in the two consecutive days after the media supposedly “sensationalized” the event. Most of the employees who became sick took days off to recuperate.

Further reading

"The June Bug: A Study of Hysterical Contagion" by Alan C. Kerckhoff, Kurt W. Back
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