 There were a series of epidemic outbursts in 1948, 1955, 1966, and 1974, whenever there was social tension or impending disaster, followed by the last widespread episode in 1984–1985 and a much smaller outbreak in 1987.The 1984–1985 epidemics lasted for over a year and affected over 3,000 persons in 16 cities and provinces.A mental health campaign was conducted for the epidemic and since then no further episodes of the epidemic has occurred in China.