Figure 1. Distribution of 395 sudden unexplained deaths (SUD) in intervention area, 1975–2009, Yunnan Province, China.

Deaths increase gradually by year to reach an average of 21 per year from 1990 to 2005. Following warnings in 2006 to villagers about eating unfamiliar mushrooms deaths decrease abruptly. A specific warning about Trogia venenata in 2008 is followed by a sustained decrease to near zero.